Name: # I can: Math Topic 3: Using Place Value to Add and Subtract Study Guide Solve 3-digit addition problems using an expanded algorithm. (3-1) Add 3-digit numbers using place-value blocks or pictures and record the results using the standard algorithm. (3-2) Add 3-digit numbers using paper-and-pencil methods and use addition to solve problems. (3-3) Add 3 or more 2-digit and/or 3-digit numbers using paper-and-pencil methods and use addition to solve problems. (3-4) Draw a picture to solve a problem. (3-5) Solve 3-digit subtraction problems by breaking them into smaller, easier subtraction problems. (3-6) Subtract 3-digit numbers using place-value blocks or pictures and record the results using the standard subtraction algorithm. (3-7) Subtract 3-digit numbers using paper-and-pencil methods and use subtraction to solve problems. (3-8) Subtract 3-digit numbers using paper-and-pencil methods and use subtraction to solve problems. (3-9) Decide whether both sides of an addition equation are equal and they will determine the value of an unknown number in an addition equation. (3-10) Decide whether both sides of a subtraction equation are equal and they will determine the value of an unknown number in a subtraction problem. (3-11) Use operations with an inverse relationship to check subtraction and addition. (3-12) Solve problems by writing a number sentence based on a picture they have drawn describing the problem. (3-13) How much effort did you put into math? Minutes Studied:
Study Guide Answers 1.) C 2.) B 3.) C 4.) 431+504=935 First, I added 400+500 to get 900. Next, I added 30+0 to get 30. Then, I added 1+4 to get 5. Finally, I added 900+30+5 to get 935.
Study Guide Answers 1.) D 2.) C 3.) I write the two addends on top of each other. First I add ones. If there are 10 or more, I regroup 10 ones for 1 ten. Then I add tens. If there are 10 or more, I regroup 10 tens for 1 hundred. Then I add hundreds. I regroup if there are 10 or more. Then I have the answer.
Study Guide Answers 1.) C 2.) D 3.) 403+268=671. First she broke apart the numbers. 403= 400+3 268=200+68 She added the hundreds. She got 600. Then she added 68+3, which is 71. 600+71=671
Study Guide Answers 1.) B 2.) B 3.) Remi forgot about place value. Like, he put the 6 in the hundred place, so the answer is way off. I lined the numbers up. Then I added: 357 + 84 6 447
Study Guide Answers 1.) C 2.) B 3.) I made a diagram with 3 parts because the problem has 3 numbers to add. The 1 st box has 12 for the 12 maples. The 2 nd box has 28 for the 28 willows. The 3 rd box has 13 for the 13 oaks. The line over the top reminds me to add all three parts to get the sum. 12+28+13= 53. Dinah counted exactly 53 trees. 53 trees 12 28 13
Study Guide Answers 1.) A 2.) D 3.) 428-154= 274 First I subtracted the hundreds from 428. There is 1 hundred in 154. 428-100= 328 Next I subtracted the tens from the new difference, 328. There are 5 tens in 154, but there are only 2 tens in 328. I subtracted the 2 tens that are there. Then I subtracted the 3 tens that were left. 328-20= 308 308-30= 278 Finally I subtracted the ones from the new number, 278. There are 4 ones in 154. 278-4=274
Study Guide Answers 1.) B 2.) D 3.) I know how many school days in all 192. That s the whole. I know one part Heath missed 24 days of school. So I have to figure out the other part how many days Heath went to school. So I subtract to find the missing part. Heath was in school for 168 days. 8 12 192-24 168
Study Guide Answers 1.) C 2.) B 3.) A 4.) 1. Look at the ones place. If the number of ones to take away is more than the number of ones you have, you regroup trade 1 ten for 10 ones. 2. Look at tens place. If the number of tens to take away is more than the number of tens you have, you regroup trade 1 hundred for 10 tens. 3. Now you can subtract. 8 13 13 943-688 255
Study Guide Answers 1.) B 2.) C 3.) Ramon made a regrouping mistake. He traded 1 hundred for 10 ones instead of 10 tens. I think he skipped the tens place. He needs to trade 1 hundreds for 10 tens, then trade 1 of those new tens for 10 ones. 9 41010 500-127 373
Study Guide Answers 1.) D 2.) A 3.) An addition fact for n+7=15 is 8+7=15. I know this is true because both sides of the equation are equal. Since 8 is in the place for n in the equation, n has to be 8.
Study Guide Answers 1.) C 2.) B 3.) A subtraction fact for n-9=5 is 14-9=5. I know this is true because both sides of the equation are equal. Since 14 is in the place for n in the equation, n has to be 14.
Study Guide Answers 1.) A 2.) C 3.) B 4.) Pete s answer is wrong. He did not regroup the 10 tens as 9 tens and 10 ones when he subtracted. 9 2 1012 3 0 2-1 1 9 1 8 3 The right answer is 183.
Study Guide Answers 1.) C 2.) D 3.) B 4.) I made a diagram to compare. The top box is for Eagle Peak 917 feet. The bottom box has two parts: I know that Slag Peak is 634 feet high. So I need to find the number to go in the? box to equal 917. Compare means subtract: 917-634=283. Eagle Peak is 283 feet taller than Slag Peak. 917 634?