One Way. Another Way Show partial products. Lesson
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1 Name Multiplication with Decimals and Whole Numbers Essential Question How can you use properties and place value to multiply a decimal and a whole number? Lesson 4.3 Number and Operations in Base Ten 5.NBT.B.7 Also 5.NBT.A.2 MATHEMATICAL PRACTICES MP5, MP7 Unlock the Problem In 2010, the United States Mint released a newly designed Lincoln penny. A Lincoln penny has a mass of grams. If there are 5 Lincoln pennies on a tray, what is the total mass of the pennies? Multiply. 5 Estimate the product. Round to the nearest whole number. 5 _ = _ One Way Use the Distributive Property. 5 = 5 (_ + 0.5) = (_ 2) + (5 _) = _ + _ = _ How much mass does one penny have? How many pennies are on the tray? Use grouping language to describe what you are asked to find. Another Way Show partial products. STEP 1 Multiply the tenths by 5. 5 _ 5 5 tenths = 25 tenths, or 2 ones and 5 tenths STEP 2 Multiply the ones by 5. _ ones = 10 ones, or 1 ten Math Talk MATHEMATICAL PRACTICES 2 Use Reason How does the estimate help you determine if the answer is reasonable? So, 5 Lincoln pennies have a mass of grams. STEP 3 Add the partial products. _ Chapter 4 245
2 Example Use place value patterns. Having a thickness of 1.35 millimeters, the dime is the thinnest coin produced by the United States Mint. If you stacked 8 dimes, what would be the total thickness of the stack? Multiply STEP 1 Write the decimal factor as a whole number. Think: = 135 STEP 2 Multiply as with whole numbers. STEP 3 Place the decimal point. Think: 0.01 of 135 is Find 0.01 of 1,080 and record the product ? , A stack of 15 dimes would have a thickness of millimeters. 1. MATHEMATICAL PRACTICE 6 Explain how you know the product of is greater than What if you multiplied 0.35 by 8? Would the product be less than or greater than 8? Explain. Share and Show MATH BOARD Place the decimal point in the product Think: The place value of the decimal factor is hundredths _ Image Credits: (tr) WidStock/Alamy Images 246
3 Name Find the product _ On Your Own Find the product. Math Talk MATHEMATICAL PRACTICES 6 Explain a Method How can you determine if your answer to Exercise 6 is reasonable? _ Practice: Copy and Solve Find the product DEEPER The cost to park a car in a parking lot is $3.45 per hour. Maleek parked his car for 4 hours on Monday, 3 hours on Tuesday, and 2 hours on Wednesday. How much did he spend on parking in all? Chapter 4 Lesson 3 247
4 MATHEMATICAL PRACTICES COMMUNICA E CONSTRUCT ARGUMENTS Use the table for DEEPER Sari has a bag containing 6 half dollars and 3 dollar coins. What is the total mass of the coins in Sari s bag? 20. SMARTER Chance has $2 in quarters. Blake has $5 in dollar coins. Whose coins have the greatest mass? Explain. Coin Mass (in grams) Nickel 5.00 Dime 2.27 Quarter 5.67 Half Dollar Dollar 8.1 WRITE Math Show Your Work 21. MATHEMATICAL PRACTICE 3 Make Arguments Julie multiplies 6.27 by 7 and claims the product is Explain without multiplying how you know Julie s answer is not correct. Find the correct answer. Personal Math Trainer 22. SMARTER Rachel and Abby are trying to solve a science homework question. They need to find how much a rock that weighs 6 pounds on Earth would weigh on the moon. They know they can multiply weight on Earth by about 0.16 to find weight on the moon. Select the partial products Rachel and Abby would need to add to find the product of 6 and Mark all that apply. A 0.22 B 0.6 C 3.65 D 3.6 E
5 Name Multiplication with Decimals and Whole Numbers Find the product. Practice and Homework Lesson 4.3 COMMON CORE STANDARDS 5.NBT.A.2, 5.NBT.B.7 Perform operations with multi-digit whole numbers and with decimals to hundredths Think: The place value of the decimal factor is tenths Problem Solving 15. A half-dollar coin issued by the United States Mint measures millimeters across. Mikk has 9 half dollars. He lines them up end to end in a row. What is the total length of the row of half dollars? 16. One pound of grapes costs $3.49. Linda buys exactly 3 pounds of grapes. How much will the grapes cost? 17. WRITE Math Compare and contrast the methods you can use to multiply a whole number and a decimal. Chapter 4 249
6 Lesson Check (5.NBT.A.2, 5.NBT.B.7) 1. Pete wants to make turkey sandwiches for two friends and himself. He wants each sandwich to contain 3.5 ounces of turkey. How many ounces of turkey does he need? 2. Gasoline costs $3.37 per gallon. Mary s father puts 9 gallons of gasoline in the tank of his car. How much will the gasoline cost? Spiral Review (5.OA.A.1, 5.OA.A.2, 5.NBT.B.6, 5.NBT.B.7) 3. A group of 5 boys and 8 girls goes to the fair. Admission costs $9 per person. What expression can show the total amount the group will pay? 4. Sue and 4 friends buy a box of 362 baseball cards at a yard sale. If they share the cards equally, how many cards will each person receive? 5. Sarah rides her bicycle 2.7 miles to school. She takes a different route home, which is miles. How many miles does Sarah ride to and from school each day? Tim has a box of 15 markers. He gives 3 markers each to 4 friends. What expression can show the number of markers Tim has left? FOR MORE PRACTICE GO TO THE Personal Math Trainer
Multiplication with Decimals and Whole Numbers. How can you use properties and place value to multiply a decimal and a whole number?
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Activity Model and record the factors of 24. Materials square tiles
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Lesson 4.7. Activity 1
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Example Use mental math and a pattern. Multiply. 50 8,000. ALGEBRA Lesson 1.5
Name Multiplication Patterns Essential Question How can you use a basic fact and a pattern to multiply by a 2-digit number? ALGEBRA Lesson 1.5 Number and Operations in Base Ten 5.NBT.A.2 MATHEMATICAL PRACTICES
Example 1. Lesson Divide by 1-Digit Numbers Essential Question How can you divide multidigit numbers and check your answers? _ groups.
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One Way Draw a model. Another Way Use division. Lesson q w 3 2
Name Factors and Divisibility Essential Question How can you tell whether one number is a factor of another number? Unlock the Problem Lesson 5.2 Operations and Algebraic Thinking 4.OA.B.4 MATHEMATICAL
One Way Find factors.
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