3rd Grade. Slide 1 / 268. Slide 2 / 268. Slide 3 / 268. Place Value. Table of Contents Place Value
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1 Slide 1 / 268 Slide 2 / 268 3rd Grade Place Value Table of Contents Slide 3 / Place Value click on the topic to go to that section - Standard, Numeric and Expanded Forms - Comparing Numbers - Ordering Numbers - Rounding to the Nearest Ten - Rounding to the Nearest Hundred - Addition - Subtraction - Solving 2 Step Word Problems - Patterns
2 Slide 4 / 268 Place Value click to return to table of contents Digits Slide 5 / Numbers, like 247, have three digits. Each digit has a different place value. 1 What place value is the digit 7 in? Slide 6 / 268 A thousands B tens 247 C hundreds D ones
3 2 What place value is the digit 4 in? Slide 7 / 268 A thousands B tens 247 C hundreds D ones 3 What place value is the digit 2 in? Slide 8 / 268 A thousands B tens 247 C hundreds D ones Place Value Slide 9 / The right digit is the ones place. It tells you that there are 7 ones. The middle digit is the tens place. It tells you that there are 4 sets of ten. The left digit is the hundreds place. It tells you that there are 2 sets of one hundred.
4 Place Value Slide 10 / 268 Hundreds Tens Ones Therefore, there are 2 sets of 100, plus 4 sets of 10, plus 7 ones in the number 247. ( =247) Slide 11 / 268 Slide 12 / 268
5 Slide 13 / 268 Slide 14 / 268 click for interactive web site Slide 15 / 268
6 Slide 16 / 268 click for another interactive site 4 How many tens are in the number 539? A 5 B 3 C 9 Slide 17 / How many hundreds are in the number 724? Slide 18 / 268 A 7 B 2 C 4
7 6 How many ones are in the number 359? Slide 19 / 268 A 5 B 9 C 3 7 Which cave's length has a 1 in the tens place? Slide 20 / 268 A B C Air Cave Water Cave Wind Cave United States Caves Cave Length in Miles Wind Cave 116 Air Cave 129 Water Cave 107 Answer Slide 21 / 268
8 Slide 22 / 268 Slide 23 / 268 Click above to be directed to a place value identification game. Place Value Game Tap the dice to roll it. Copy the numbers below in the order that they are rolled. Slide 24 / 268 Circle the digit in the tens place. Cross out the digit in the hundreds place. Underline the digit in the ones place. Write the number that is 10 more than this number. Write the number that is 100 less than this number. erase and try several examples
9 8 What is the value of the underlined digit? 921 Slide 25 / 268 A 21 B 920 C 20 D 2 9 What is the value of the underlined digit? 743 A 700 B 740 C 3 D 30 Slide 26 / What is the value of the underlined digit? 493 Slide 27 / 268 A 490 B 4 C 400 D 493
10 11 What number is 30 more than 325? A 625 B 355 C 328 D 55 Slide 28 / What number is 500 more than 325? Slide 29 / 268 A 375 B 330 C 352 D 825 Slide 30 / 268 Standard, Numeric, Expanded Forms click to return to table of contents
11 Forms Slide 31 / 268 You can write numbers in different ways. Standard form is writing a number out in digits. 674 Expanded form is writing a number out according to each digit's place value Word form is writing a number out in words. six hundred seventy-four Slide 32 / 268 Forms Slide 33 / 268 Take the number 235 and write it in expanded form
12 Forms Slide 34 / 268 Write the number 235 in word form. - twenty five fifty two three thirty two hundred five hundred three hundred Forms Slide 35 / 268 Forms Slide 36 / 268 Fill in the blanks in the chart. Standard Form Expanded Form Word Form seventy-five six hundred three
13 Click for web site practice. Practice Slide 37 / 268 Click for web site practice. Practice Slide 38 / What is the number , written in standard form? Slide 39 / 268 A two hundred fifty-four B 254 C D 200,504
14 14 What is the number 108, written in expanded form? Slide 40 / 268 A B one hundred eight C one hundred and eight D What is the number 211, written in word form? Slide 41 / 268 A two hundred ten-one B C two hundred eleven D What is the number four hundred two, written in standard form? A 4,002 B C 402 D four hundred and two Slide 42 / 268
15 17 Which letter has the number 198 written properly in both word form and expanded form? Slide 43 / 268 A one hundred ninety-eight, B one hundred ninety-eight, C one hundred ninety and eight, D one hundred ninety and eight, What number is missing? 500 +? + 8 = 528 A 2 B 20 C 200 Slide 44 / What number is missing? ? = 1749 A 70 B 700 C 7 Slide 45 / 268
16 Slide 46 / 268 Comparing Numbers click to return to table of contents Comparing Numbers Slide 47 / 268 There are two symbols we use to compare numbers. > (greater than) < (less than) One number goes on the left of the symbol and another number goes on the right of the symbol. The number on the left of the ">" shows the larger number. For example: 2 > 1 The number on the left of the "<" shows the smaller number. For example: 1 < 2 Comparing Numbers Slide 48 / 268 Remember, one number goes on the left of the symbol and another number goes on the right of the symbol. The number on the left of the ">" shows the larger number. For example: 2 > 1 This means that "2 is greater than 1" The number on the left of the "<" shows the smaller number. For example: 1 < 2 This means that "2 is less than 1"
17 Slide 49 / 268 Use a Place Value Chart Slide 50 / 268 Compare digits in the same place-value position from left to right. Hundreds Tens Ones hundreds is greater than 2 hundreds. 334>245 Comparing Numbers Slide 51 / 268 Use a number line The numbers are in order from least to greatest is to the right of >245
18 Comparing Numbers Game Slide 52 / 268 Click to play a game that compares numbers. 20 Which number is the largest? Slide 53 / 268 A 485 B 995 C 985 D Which number has the most hundreds? Slide 54 / 268 A 156 B 942 C 755 D 1665
19 22 Which number sentence is written properly? Slide 55 / 268 A 169>197 B 687<129 C 657<546 D 983> Which number is greater than 845? Slide 56 / 268 A 651 B 267 C 1,845 D Which symbol should you use to complete this number sentence? Slide 57 / A = B > C <
20 25 Which symbol should you use to complete this number sentence? Slide 58 / A = B > C < 26 Which symbol should you use to complete this number sentence? Slide 59 / A = B > C < 27 Part A What is the number with the least value that can be made with the digits 6, 7, and 5 using all the digits only once? Slide 60 / 268 A 576 B 657 C 675 D 567 From PBA PARCC sample test #16
21 28 Part B Daniel says the number with the greatest value he can make with the digits 5, 7, and 6 using the digits only once is 657 because the 7 is in the place with the greatest value. Explain why Daniel is not correct. What is the number with the greatest value he can make using all the digits only once? Explain how you know this number has the greatest value. Slide 61 / 268 From PBA PARCC sample test #16 Slide 62 / 268 Ordering Numbers click to return to table of contents Ordering Numbers Slide 63 / 268 When you order numbers write them from: least to greatest or greatest to least.
22 Ordering Numbers Slide 64 / 268 Use place value. Step 1 Compare the Hundreds. Step 2 Compare the Tens. Hundreds Tens Ones Hundreds Tens Ones =2=2 1<2<7 So the order is 210; 226; 273. Ordering Numbers Slide 65 / 268 Use a number line Since 273 is to the right of the other numbers, it is the greatest number. 273 > 226 > 210 Ordering Numbers Slide 66 / 268 Put these numbers in order from least to greatest.
23 Ordering Numbers Slide 67 / 268 Put these numbers in order from greatest to least. Ordering Numbers Slide 68 / 268 Tap the dice to roll it. Copy the digits below in the order that they are rolled. Now arrange the digits to make the largest number. Now arrange the digits to make the smallest number. Challenge: Repeat these steps a second time. Then put all of the numbers you created in order from least to greatest! Click to play a place value game. Slide 69 / 268
24 29 Which group of numbers are in order from largest to smallest? A 456, 498, 472, 431 B 431, 456, 498, 472 C 431, 456, 472, 498 Slide 70 / 268 D 498, 472, 456, Which group of numbers are in order from smallest to largest? A 511, 423, 583, 457 B 511, 423, 457, 583 Slide 71 / 268 C 423, 457, 511, 583 D 583, 511, 457, Which group of numbers are in order from smallest to largest? Slide 72 / 268 A 365, 321, 359, 328 B 321, 328, 359, 365 C 365, 359, 328, 321 D 321, 359, 328, 365
25 32 What number could fill in the blank and have the numbers ordered from least to greatest? Slide 73 / , 45, 125,, What number could fill in the blank and have the numbers ordered from greatest to least? Slide 74 / , 313,, 301, 295 Slide 75 / 268 Rounding to the Nearest Ten click to return to table of contents
26 Rounding to the Nearest Ten Slide 76 / 268 Rounding makes numbers that are easier to work with in your head. Rounded numbers are only approximate. An exact answer generally can not be obtained using rounded numbers. Use rounding to get an answer that is close but that does not have to be exact. Rounding to the Nearest Ten Slide 77 / 268 Rounding is all about place value. When rounding to the nearest tens place you know you will either stay at that tens place or round up to the next tens place. Look next door at the digit in the ones place. If the digit is a 0, 1, 2, 3, or 4 you will stay at the current tens place. For example, 74 rounded to the nearest ten would be 70. If the digit is a 5, 6, 7, 8, or 9 you will round up to the next possible tens place. For example, the number 88 rounded to the nearest ten would be 90. Rounding to the Nearest Ten Slide 78 / 268
27 Rounding to the Nearest Ten Slide 79 / 268 Round each to the nearest ten. Use the magnifying glass to check your answers Practice Rounding to the Tens (click here) Slide 80 / What is 86 rounded to the nearest ten? A 70 B 80 C 90 Slide 81 / 268
28 35 What is 32 rounded to the nearest ten? Slide 82 / 268 A 20 B 30 C What is 64 rounded to the nearest ten? Slide 83 / What is 27 rounded to the nearest ten? Slide 84 / 268
29 38 What is 93 rounded to the nearest ten? Slide 85 / What is 98 rounded to the nearest ten? Slide 86 / What is 418 rounded to the nearest ten? Slide 87 / 268
30 41 What is 274 rounded to the nearest ten? Slide 88 / The owners of a new toy store have 888 puzzles to sell. They sell 237 puzzles the first month. They sell 461 puzzles the second month. Slide 89 / 268 Which of these shows the three given numbers, each rounded to the nearest 10? A 880, 230, 470 B 880, 230, 460 C 890, 240, 470 D 890, 240, 460 From EOY PARCC sample test #15 43 Use the rounded numbers from the last question to find about how many puzzles the owners have left to sell. Slide 90 / 268 From PARCC sample test
31 Slide 91 / 268 Rounding to the Nearest Hundred click to return to table of contents Rounding to the Nearest Hundred Slide 92 / 268 When rounding to the nearest hundreds place you know you will either stay at that hundreds place or round up to the next hundreds place. Look next door at the digit in the tens place. If the digit is a 0, 1, 2, 3, or 4 you will stay at the current hundreds place. For example, 124 rounded to the nearest hundred would be 100. If the digit is a 5, 6, 7, 8, or 9 you will round up to the next possible hundreds place. For example, the number 178 rounded to the nearest hundred would be 200. Rounding to the Nearest Hundred Slide 93 / 268 Another way of thinking about it would be: To round numbers to the nearest hundred, make the numbers that end in 1 through 49 into the next lower number that ends in 00. For example 424 rounded to the nearest hundred would be 400. Numbers that have the last two digits of 50 or more should be rounded up to the next even hundred. The number 679 rounded to the nearest hundred would be 700. The number 988 rounded to the nearest hundred would be 1000 because that is the next possible hundred. There were 9 hundreds and now there are 10.
32 Rounding to the Nearest Hundred Slide 94 / 268 Rounding to the Nearest Hundred Slide 95 / 268 Round each to the nearest hundred. Use the magnifying glass to check your answers Practice Rounding to the Hundreds (click here) Slide 96 / 268
33 44 What is 319 rounded to the nearest hundred? A 320 B 300 C 400 Slide 97 / What is 781 rounded to the nearest hundred? Slide 98 / 268 A 700 B 800 C What is 263 rounded to the nearest hundred? Slide 99 / 268
34 47 What is 665 rounded to the nearest hundred? Slide 100 / What is 421 rounded to the nearest hundred? Slide 101 / What is 870 rounded to the nearest hundred? Slide 102 / 268
35 50 What is 149 rounded to the nearest hundred? Slide 103 / What is 975 rounded to the nearest hundred? Slide 104 / 268 Slide 105 / 268 More Rounding Practice
36 Round 537 to the nearest ten. Slide 106 / Put your pencil point under the digit in the tens place. Look to the right. 2. Is the digit 5 or more? Yes OR No 3. What happens to the 3? Increases by 1 OR remains the same 4. What happens to everything to the left of the tens place? Those digits always remain the same. 5. Write the answer Round 413 to the nearest ten. Slide 107 / Put your pencil point under the digit in the tens place. Look to the right. 2. Is the digit 5 or more? Yes OR No 3. What happens to the 1? Increases by 1 OR remains the same 4. What happens to everything to the left of the tens place? Those digits always remain the same. 5. Write the answer Round 837 to the nearest hundred. Slide 108 / Put your pencil point under the digit in the hundreds place. Look to the right. 2. Is the digit 5 or more? Yes OR No 3. What happens to the 8? Increases by 1 OR remains the same 4. What happens to everything to the left of the hundreds place? Those digits always remain the same. 5. Write the answer
37 Round 1,439 to the nearest hundred. Slide 109 / Put your pencil point under the digit in the hundreds place. Look to the right. 2. Is the digit 5 or more? Yes OR No 3. What happens to the 4? Increases by 1 OR remains the same 4. What happens to everything to the left of the hundreds place? Those digits always remain the same. 5. Write the answer 52 What is 875 rounded to the nearest ten? Slide 110 / What is 329 rounded to the nearest ten? Slide 111 / 268
38 54 What is 629 rounded to the nearest hundred? Slide 112 / What is 321 rounded to the nearest hundred? Slide 113 / What is 806 rounded to the nearest ten? Slide 114 / 268
39 57 What is 348 rounded to the nearest ten? Slide 115 / What is 1,242 rounded to the nearest ten? Slide 116 / What is 1,818 rounded to the nearest hundred? Slide 117 / 268
40 60 What is 608 rounded to the nearest hundred? Slide 118 / What is 971 rounded to the nearest hundred? Slide 119 / 268 Slide 120 / 268 Addition click to return to table of contents
41 Addition Table of Contents Slide 121 / Addition Properties - Missing Addends - Estimate Sums - Add 2 digit numbers - Add 3 digit numbers - Addition Story Problems click on the topic to go to that section Slide 122 / 268 Addition Properties Click to Return to Addition Table of Contents Addition Properties Slide 123 / 268 There are 3 properties of Addition Commutative Property- You can add numbers in any order and get the same sum (answer). Identity Property- You can add a zero to any number and the sum will equal the original number. Associative Property- You can group the addends (numbers being added) in different ways and the sum will be the same.
42 Commutative Property Slide 124 / 268 is the same as = = 8 So, = Identity Property Slide 125 / = So, = 4 Associative Property Slide 126 / 268 is the same as (3 + 4) + 2 = (4 + 2) = 9 So, (3 + 4) + 2 = 3 + (4 + 2)
43 Addition Properties Slide 127 / 268 Place each number sentence under its correct property. 62 An example of the Identity Property is 0 = Slide 128 / 268 True False 63 Does = 4 + 8? Slide 129 / 268 Yes No Commutative Property click here for property
44 64 Which number sentence equals 15? Slide 130 / 268 A (3 + 5) + 7 B 3 + (5 + 7) C Both A and B Associative Property click here for property 65 What is the name of the property that allows to equal 23? A B C D Commutative Associative Identity All of the above Slide 131 / What is the sum of (5 + 6) + 2? Slide 132 / 268
45 Slide 133 / 268 Missing Addends Click to Return to Addition Table of Contents Missing Addends Slide 134 / 268 In an addition equation such as = 11: 5 and 6 are called the addends and 11 is called the sum = 11 addend addend sum Missing Addends Slide 135 / 268 Sometimes we are given a problem with a missing addend. 4 +? = 6 12 = = 10 7 = a + 3 We have to figure out the number that is missing.
46 Missing Addends Slide 136 / 268 Try to use addition facts 7 + = 11 Ask yourself, "What do I add to 7 to get the answer 11?" Missing Addends Slide 137 / 268 Try to use a subtraction fact? + 8 = 12 Ask yourself, "What is the answer to 12 subtract 8?" Missing Addends Slide 138 / 268 Match the number sentence with its missing addend. 6 +? = 9 7 x + 4 = =? = 5 +? 6 5 +? = 12 5
47 67 What is the missing addend? 5 + = 11 Slide 139 / What is the missing addend? 15 = + 9 Slide 140 / Is the missing addend 4 for this problem? 4 + a = 4 Slide 141 / 268 Yes No
48 70 The same number can be used to fill both missing addend spaces. + = 14 Slide 142 / 268 True False 71 There are 16 seats on a roller coaster. If 10 of the seats are already filled, how many more seats can be filled? Slide 143 / 268 A 26 B 6 C 10 D Enter your answer in the box. Slide 144 / = 568 From PARCC sample questions
49 Slide 145 / 268 Estimate Sums Click to Return to Addition Table of Contents Estimating Sums Slide 146 / 268 When you estimate sums, you round the numbers or use compatible numbers to find an estimate of what the sum may be before you add. Estimating Sums Using Rounding Slide 147 / 268 Round each number to the nearest ten. Then add to find the estimated sum. click click
50 Using compatible numbers Find numbers that are close to the numbers you are working with. These numbers are called compatible numbers. Slide 148 / 268 click click Estimating Sums Slide 149 / 268 Click on button to play a Estimating Sums game! 73 When you need to estimate 256 while estimating sums, could you estimate it to 250? Slide 150 / 268 Yes No
51 74 The estimated sum of 24 and 15 is 50. Slide 151 / 268 True False 75 What is the estimated sum of ? Slide 152 / 268 A 780 B 790 C 700 D A family trip involved driving 731 miles to its first stop and 475 miles to its second. About how many miles did the family have to travel? Slide 153 / 268 A B C D 200 miles 1,000 miles 1,200 miles 2,000 miles
52 77 What is the estimated sum for ? Slide 154 / 268 Slide 155 / 268 Add 2-Digit Numbers Click to Return to Addition Table of Contents Adding 2-Digit Numbers Slide 156 / 268 How to add two 2-digit numbers without regrouping. For example, You will first have to place the numbers on top of one another. Make sure to line up the place values Add the ones' place digits ( ). This sum is less than 9 so regrouping is not necessary. So place the 8 under the ones place. Next, add the tens' place digits ( ). Place the 7 under the tens place.
53 Adding 2-Digit Numbers Slide 157 / 268 How to add two 2-digit numbers with regrouping. For example, You will first have to place the numbers on top of one another. Make sure to line up the place values Add the ones' place digits ( ). This sum is more than 9 so you need to regroup. Place the 3 in the ones' place and the 1 in the tens place. Next, add the tens' place digits ( ). Place the 9 under the tens place. Practice Slide 158 / 268 Practice with grid paper. Use the boxes to help line up the numbers Practice Slide 159 / 268 Click the button to play a addition game.
54 78 The sum of is 70. Slide 160 / 268 True False 79 Is 36 the sum of ? Slide 161 / 268 Yes No 80 What is the sum? = Slide 162 / 268
55 81 What is the sum? = Slide 163 / What is the sum? = Slide 164 / Which is the sum? = Slide 165 / 268 A 99 B 122 C 75 D 125
56 84 What is the sum? = Slide 166 / 268 Slide 167 / 268 Add 3-Digit Numbers Click to Return to Addition Table of Contents Adding 3-Digit Numbers Slide 168 / 268 To add two 3-digit numbers, place one 3-digit number on top of the other 3- digit number. For example, becomes: Remember to: Make sure to line up the digits based on their place values. Add the ones' digit place first. If the sum is less than 9, no regrouping is necessary. Next, add the tens' place. If the sum is greater than 9, you will need to regroup and place a 1 on the hundreds place.
57 Adding 3-Digit Numbers Find each sum. Pop the balloon to see if you are correct. Slide 169 / ,136 1,010 Adding 3-Digit Numbers Solve each problem. Pass the magnifying glass over to see it you are correct. Slide 170 / = = = = = = = = = = = = = = Adding 3-Digit Numbers Slide 171 / 268 Click on the button to model addition with base ten blocks.
58 85 The sum of is 726. Slide 172 / 268 True False 86 Can the sum of two 3-digit numbers equal a 4-digit number? Slide 173 / 268 Yes No 87 Find the sum of =? Slide 174 / 268 A 1,234 B 444 C 246 D 66
59 88 Find the sum of Slide 175 / What is the sum of ? Slide 176 / A sporting goods store sold 159 baseballs and 354 golf balls last month. How many balls did the store sell last month in all? Slide 177 / 268
60 91 Enter your answer in the box. Slide 178 / = 568 From EOY PARCC sample test #34 92 Which expression could be used to find the value of ? Slide 179 / 268 A B C D From EOY PARCC sample test #38 Slide 180 / 268 Addition Story Problems Click to Return to Addition Table of Contents
61 Addition Story Problems Slide 181 / 268 When solving story problems, make sure you read the entire problem. You may have to reread the problems to make sure you understand what it is asking you. Be careful of "invisible" numbers. Words like week, dozen, double, etc. can stand for numbers. A number sentence can also be called an expression or an equation. It is showing how you did the math using numbers and math symbols. For example, if I solved a problem by adding 64 and 18 my number sentence would be: = 82 Addition Story Problems Slide 182 / 268 Two turtles laid eggs on the beach. One laid 151 eggs and the other laid 206 eggs. How many eggs were there in all? What is the number sentence? Addition Story Problems Slide 183 / 268 A school placed an order for 500 pencils and 700 colored pencils. How many pencils were ordered in all? Number sentence:
62 Addition Story Problems Slide 184 / 268 There are 365 days in a year. How many days are in two years? Number sentence: Addition Story Problems Slide 185 / 268 A farmer planted 120 tomato seeds and 56 pepper seeds. How many plants were planted in all? Number sentence: Addition Story Problems Slide 186 / 268 On the way to her birthday party, Mara dropped 1 box of a dozen cupcakes. She still had two more boxes. How many cupcakes does she still have? Number Sentence:
63 Math Game Slide 187 / 268 Click the baseball to play Grand Slam Math. 93 Jason read 45 pages on Monday night and 26 pages on Tuesday night. He read a total of 71 pages. True False Slide 188 / The second grade collected 243 bottle caps and the third grade collected 534. Did they collect more than 800 caps? Slide 189 / 268 Yes No
64 95 Gavin had $300 in his bank account. His grandmother deposited $150. How much does he have now? Slide 190 / 268 A $150 B $550 C $450 D $ We have to drive 48 miles to reach Philadelphia, PA. How many miles will we have traveled there and back? Slide 191 / How many feet of wood would be needed to finish a 276 foot long bridge, if 155 feet has already been completed? Slide 192 / 268
65 98 Kevin makes muffins. - It takes 8 minutes to mix the batter. - The muffins bake for 17 minutes. - The muffins then cool for 5 minutes. Slide 193 / 268 What is the total amount of time, in minutes, Kevin spends mixing, baking, and cooling the muffins? From EOY PARCC sample test #1 Slide 194 / 268 Subtraction click to return to table of contents Subtraction Table of Contents Slide 195 / 268 Estimate Differences 2-Digit Subtraction 3-Digit Subtraction Subtraction Across Zeros Checking Subtraction with Addition click on the topic to go to that section
66 Slide 196 / 268 Estimate Differences Click to Return to Subtraction Table of Contents Estimating Differences Slide 197 / 268 When you estimate differences, you round the numbers or use compatible numbers to find an estimate of what the difference may be before you subtract. Using Rounding Round each number to the nearest ten. Then add to find the estimated difference. Slide 198 / 268 click click
67 Using Compatible Numbers Slide 199 / 268 Find numbers that are close to the numbers you are working with. These numbers are called compatible numbers. click click Estimating Differences Slide 200 / 268 Click on button to play a Estimating Differences game! 99 When you need to estimate 256 while estimating differences, could you estimate it to 250? Slide 201 / 268 Yes No
68 100 The estimated difference of 74 and 26 is 50. Slide 202 / 268 True False 101 What is the estimated difference of ? Slide 203 / 268 A 780 B 790 C 700 D A family trip involved driving 731 miles. They have already traveled 475 miles. About how many more miles did the family have to travel? Slide 204 / 268 A 200 miles B 1,000 miles C 1,200 miles D 2,000 miles
69 103 What is the estimated difference for 68-45? Slide 205 / 268 Slide 206 / Digit Subtraction Click to Return to Subtraction Table of Contents 2-Digit Subtraction Slide 207 / digit Subtraction without regrouping When you subtract two 2-digit numbers, it is important to line up the digits based on their place values. For example, = should be written as: First, subtract the ones' column. 5 is greater than 4, so regrouping is not needed. Then, subtract the tens' column.
70 2 digit Subtraction with Regrouping When you subtract two 2-digit numbers, it is important to line up the digits based on their place values. For example, = should be written as: First, subtract the ones' column. 4 is less than 6, so regrouping is needed. Take away one of the tens, so 5 tens becomes 4 tens. Add that extra 10 to the ones column, so = 14. Now you can subtract the 14-6 in the ones column. Then, subtract the tens' column. 2-Digit Subtraction Slide 208 / Digit Subtraction Slide 209 / 268 Use base ten blocks to model subtraction. 2-Digit Subtraction Slide 210 / 268
71 2-Digit Subtraction Game Slide 211 / 268 Click button to play a subtraction game needs to be regrouped. Slide 212 / 268 True False 105 The difference of 46 and 21 is 25? Slide 213 / 268 Yes No
72 106 What is 77-19? Slide 214 / What is the estimated and actual difference of 46-23? Slide 215 / 268 A 20 and 23 B 30 and 69 C 30 and 32 D 30 and Samantha sold 89 shirts. She has delivered 24 of them. How many does she still have to deliver? Slide 216 / 268
73 Slide 217 / Digit Subtraction Click to Return to Subtraction Table of Contents 3-Digit Subtraction Slide 218 / 268 When finding the difference of two 3-digit numbers, you must make sure the digits are lined up based on their place value. For example, should be written as: Find the difference in the ones' column. 4 is not larger than 9, therefor we need to regroup. Find the difference in the tens' column. 6 is larger than 5, therefor we do not need to regroup. Find the difference in the hundreds' column. 3-Digit Subtraction Slide 219 / 268 Click the button to model 3-digit subtraction using base ten blocks.
74 3-Digit Subtraction Slide 220 / 268 Click on the button to play a 3- digit subtraction game needs to be regrouped? Slide 221 / 268 True False 110 What is the estimated difference of ? Slide 222 / 268 A 600 B 650 C 606 D 60
75 111 What is the difference of ? Slide 223 / 268 A 606 B 656 C Yesterday, 915 people went to the zoo. Today, only 710 came. How many more people visited yesterday? Slide 224 / What is the difference of 150 and 25? Slide 225 / 268
76 114 Carla buys apples and peaches at the store. The mass of the apples is 724 grams and the mass of the peaches is 471 grams. How much greater is the mass of the apples than the mass of the peaches? Slide 226 / 268 grams From EOY PARCC sample test # Slide 227 / =? From EOY PARCC sample test #14 Slide 228 / 268 Subtraction Across Zeroes Click to Return to Subtraction Table of Contents
77 Subtraction Across Zeroes Slide 229 / 268 An example of "Subtracting Across Zeroes" is the problem, When this problem is written with its digits lined up based on their place values, it looks like: First, look at the numbers in the ones' column. 0 is not larger than 9, so regrouping is needed. However, we cannot regroup the tens' column because it, too, has a zero on top. So we then must regroup the hundreds' column. Subtraction Across Zeroes Slide 230 / 268 Regroup the hundreds' column by crossing out the 5 and making it a 4. Then, make the tens' column 0 a Regroup the tens' column by crossing out the 10 and making it a 9. Then make the ones' column 0 a Can you remember the order of subtracting across the zeroes? Drag the sentences to show the order =? Subtraction Across Zeroes Regroup 1 hundred from the 4, change it to a 3. Now, the zero in the tens place can become a 10. Now, the zero in the ones place can become a 10. Regroup from the tens place so 10 becomes a 9. Subtract 10-9 in the ones place, then 9-8 in the tens place, and last 3-3 in the Decide if you need hundreds place. to regroup. Slide 231 / 268
78 116 The difference of 800 and 423 is 423? Slide 232 / 268 True False 117 Could you check your answer to a subtraction problem with addition? Slide 233 / 268 Yes No 118 Which number will make the number sentence true? = A 453 B 457 C 853 D 347 Slide 234 / 268
79 119 What is the difference of 800 and 799? Slide 235 / Sarah needs 500 tickets to get a prize at the arcade. She has already received 161 tickets from playing her favorite games. How many more tickets does she need? Slide 236 / 268 Slide 237 / 268 Checking Subtraction with Addition Click to Return to Subtraction Table of Contents
80 Checking Subtraction with Addition Slide 238 / 268 Sometimes, mistakes are made when we subtract. Estimating is one way to check the reasonableness of our work. But, we can also use addition to check our subtraction. You already know that you can use fact families. For example, the subtraction problem 9-5=4 can be checked with the addition problem 4+5=9. The same can be done with larger numbers. Checking Subtraction with Addition Slide 239 / 268 When checking a subtraction problem with addition, add the number that is subtracted and the answer. You should end up with the original number you started with You can check a difference with a related sum? Slide 240 / 268 True False
81 122 Would you use = 52 to check = 37? Slide 241 / 268 Yes No = 300 can be checked with = 426. Do you agree? Slide 242 / 268 Yes No 124 What number sentence would you use to check your answer to = 160? Slide 243 / 268 A = 160 B = 160 C = 194 D = 354
82 125 When checking the subtraction problem, = 300, what number could you write first in your addition problem? Slide 244 / 268 Slide 245 / 268 Solving 2 Step Word Problems click to return to table of contents Solving 2 Step Word Problems Slide 246 / 268 Sometimes, you have a story problem that requires more than one step. Take a look at the problem below. Jenna and Matthew were adding pencils to their collections. Find how many they collected in the chart. How many more pencils does Jenna have than Matthew after both days? Pencils Collected Jenna Matthew Day Day
83 Solving 2 Step Word Problems Slide 247 / 268 Pencils Collected Jenna Matthew Day Day To begin, we must find out how many they each have total before we can find the difference. Add. Jenna has = 42 Matthew has = 27 Now, we can find the difference = 15 Jenna has 15 more pencils in her collection than Matthew. 126 Todd and Amy are competing to see how many pushups they can complete. Looking at the chart below, after both days of the competition, how many more pushups has Todd completed than Amy? Slide 248 / 268 push ups compelted Todd Amy Day Day Answer 127 "Ashley bought balloons for the birthday party. She purchased 28 balloons in all. 5 were pink, 6 were yellow, and 8 were green. How many blue balloons must there have been?" This is a 2-step question. Slide 249 / 268 True False
84 128 Now, solve. Ashley bought balloons for the birthday party. She purchased 28 balloons in all. 5 were pink, 6 were yellow, and 8 were green. How many blue balloons must there have been? Slide 250 / Adam brought snacks to the pool. In all, he brought 24 pieces of fruit. He brought 6 apples and 7 peaches. How many bananas must he have brought? Slide 251 / 268 A 12 bananas B 24 bananas C 11 bananas D 8 bananas 130 Molly and her sister Olivia went on a road trip. See the chart to show how many miles they each drove. How many more miles did Molly drive than Olivia? Slide 252 / 268 Road Trip Molly Olivia Saturday Sunday Answer
85 131 Pablo goes to a stamp show where he can share, buy and sell stamps. The first day, Pablo starts with 744 stamps. He buys 27 stamps from his friend. He then sells 139 stamps. What is the total number of stamps that Pablo has after the first day? Slide 253 / 268 From EOY PARCC sample test # Part A A library has 126 books about trees. The library has 48 fewer books about rivers than about trees. Select from the choices to correctly complete the statement. The number of books the library has about rivers is and the total number of books the library has about trees and rivers is. Slide 254 / 268 A 48 B 78 C 174 D 174 E 204 F 300 From EOY PARCC sample test # This library still has 126 books about trees. Two students borrow books about trees. Each student borrows 8 books. How many books about trees remain in the library? Slide 255 / 268 From EOY PARCC sample test #24
86 134 Third-grade students took a total of 1,000 pictures for the yearbook during the school year. Ted took 72 pictures. Mary took 48 pictures. Part A What is the total number of pictures taken by the rest of the third-grade students during the school year? Slide 256 / 268 From PBA PARCC sample test #3 135 Third-grade students took a total of 1,000 pictures for the yearbook during the school year. Ted took 72 pictures. Mary took 48 pictures. Part B Ella took 8 more pictures than Ted took. How many more pictures did Ella take than Mary? Slide 257 / 268 From PARCC PBA sample test #3 136 Part A Nolan has 16 pennies in one jar and 94 pennies in another jar. He uses some of the pennies to buy a pencil that costs 25 cents. What is the total number of pennies Nolan has left after he buys the pencil. Show your work. Slide 258 / 268 From PBA PARCC sample test #15
87 137 Part B Nolan saves some more pennies and now has 187 pennies all in one jar. He finds 10 more in his pocket. What is the total number of pennies Nolan has after he adds the 10 pennies from his pocket to the jar? Slide 259 / 268 From PBA PARCC sample test # Part C The table shows the number of pennies Nolan saved each week for four weeks. Slide 260 / 268 What is the total number of pennies Nolan saves during the four weeks? Show your work. From PARCC sample test Slide 261 / 268 Patterns click to return to table of contents
88 Patterns Slide 262 / 268 Many times we can use patterns to help us solve addition and subtraction problems. Often, patterns are identified in a table by sharing the rule. Rule: Add 3 Each time we move from the left side of the table, to the right, we add three Patterns Slide 263 / 268 Other times, we identify a pattern by counting up by a common number. For example, if you were counting up by 5's you would say 5, 10, 15, and so on. Using this pattern, you could find out what would come next after 85 by thinking = In the table below, what is the rule? Slide 264 / 268 A add 4 B subtract 4 C add 6 D subtract 6 Answer
89 140 If the rule is subtract 5, what would go in the empty box? Slide 265 / ? Answer 141 Counting by 10s, what number would come after 110? Slide 266 / The rule is Slide 267 / 268 True False Answer
90 143 Edgar is counting up by 20s from 24. He says, "24, 44, 64, 84, " What number would he say next? Slide 268 / 268
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