Work with a partner. Use base ten blocks to model the division. Then find the quotient. a Begin by modeling
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1 2.6 Dividing Decimals decimal division? How can you use base ten blocks to model 1 ACTIVITY: Dividing Decimals Work with a partner. Use base ten blocks to model the division. Then find the quotient. a Begin by modeling How many of each base ten block did you use? ones tenths hundredths Next, think of the division problem as the question, How can you divide 2.4 into groups of.6? Rearrange the model for 2.4 into groups of.6. There are groups of.6. COMMON CORE Dividing Decimals In this lesson, you will use models to divide decimals. divide decimals. Learning Standard 6.NS.3 So, =. b c d e f. Write and solve the division problem represented by the model Chapter 2 Fractions and Decimals
2 2 ACTIVITY: Dividing Decimals Math Practice Evaluate Results What can you do to check the reasonableness of your answer? Work with a partner. Use base ten blocks to model the division. Then find the quotient. a..3.6 Model.3. Replace tenths with hundredths. How many.6 s are in.3? Divide hundredths into groups of.6. There are groups of.6. So,.3.6 =. b..2.4 c..6.1 d e IN YOUR OWN WORDS How can you use base ten blocks to model decimal division? Use examples from Activity 1 and Activity 2 as part of your answer. 4. WRITING Newton s poem is about dividing fractions. Write a poem about dividing decimals. When you must divide a fraction, do this very simple action: Flip what you re dividing BY, and then it s easy---multiply! 5. Think of your own cartoon about dividing decimals. Draw your cartoon. Use what you learned about dividing decimals to complete Exercises 8 11 on page 97. Section 2.6 Dividing Decimals 93
3 2.6 Lesson Lesson Tutorials Dividing Decimals by Whole Numbers Words Place the decimal point in the quotient above the decimal point in the dividend. Then divide as you would with whole numbers. Continue until there is no remainder. Numbers ) 7.32 Place the decimal point in the quotient above the decimal point in the dividend. EXAMPLE 1 Dividing Decimals by Whole Numbers a. Find Estimate 8 4 = ) So, = 1.9. Reasonable? b. Find Place the decimal point in the quotient above the decimal point in the dividend ) So, =.365. Place the decimal point in the quotient above the decimal point in the dividend. Insert a zero and continue to divide. Check = 4.38 Exercises Divide. Use estimation to check your answer Chapter 2 Fractions and Decimals
4 Dividing Decimals by Decimals Words Multiply the divisor and the dividend by a power of 1 to make the divisor a whole number. Then place the decimal point in the quotient and divide as you would with whole numbers. Continue until there is no remainder. Numbers ) ) 45.6 Place the decimal point above the decimal point in the dividend Multiply each number by 1. Study Tip EXAMPLE Multiplying the divisor and the dividend by a power of 1 does not change the quotient. For example: = = = 13 2 Dividing Decimals a. Find Place the decimal point 13. above the decimal point 1.4 ) ) 182. in the dividend Multiply each number by So, = 13. Check = 18.2 b. Find ) ) Multiply each number by 1. So, =.7. Check.7.39 =.273 Exercises Divide. Check your answer ) ) Section 2.6 Dividing Decimals 95
5 EXAMPLE 3 Inserting Zeros in the Dividend and the Quotient Study Tip Remember to check your answer by multiplying the quotient by the divisor. Divide ) ) Multiply each number by Insert a zero in the dividend. So, = 35. Because 7 =, insert a zero in the quotient. Exercises 4 43 Divide. Check your answer EXAMPLE 4 Real-Life Application How many times more cellular phone subscribers were there in 211 than in 1991? Round to the nearest whole number. Subscribers (millions) Cellular Phone Subscribers Year From the graph, there were million subscribers in 211 and 7.6 million in So, divide by 7.6. Estimate 32 8 = ) ) Rounds to 44. So, there were about 44 times more subscribers in 211 than in Reasonable? How many times more subscribers were there in 26 than in 1996? Round to the nearest whole number. 96 Chapter 2 Fractions and Decimals
6 2.6 Exercises Help with Homework 1. NUMBER SENSE Fix the one that is not correct ) ) ) 2.44 Copy the problem and place the decimal point in the correct location = = = 1261 Rewrite the problem so that the divisor is a whole number ) ) ) (-6)=3 3+(-3)= 4+(-9)= 9+(-1)= Use base ten blocks to find the quotient Divide. Use estimation to check your answer ) ) ) ) ERROR ANALYSIS Describe and correct the error in finding the quotient ) ) TEXT MESSAGING You send 4 text messages in one month. The total cost is $4.8. How much does each text message cost? 27. SUNBLOCK Of the two bottles of sunblock shown, which is the better buy? Explain. 4-ounce bottle $ ounce bottle $1.29 Section 2.6 Dividing Decimals 97
7 ORDER OF OPERATIONS Evaluate the expression (5.4 9) Fruit Punch Sale Price 4-pack $ pack $ pack $ FRUIT PUNCH Which pack of fruit punch is the best buy? Explain. 35. SALE You buy 3 pairs of jeans for $35.95 each and get a fourth pair for free. What is your cost per pair of jeans? 2 3 Divide. Check your answer ) ) Divide. Round to the nearest hundredth if necessary ERROR ANALYSIS Describe and correct the error in rewriting the problem..32 ) ) TICKETS Tickets to the school musical cost $6.25. The amount received from ticket sales is $ How many tickets were sold? 5. HEIGHT A person s running stride is about 1.14 times the person s height. Your friend s stride is feet. How tall is your friend? 51. MP3 PLAYER You have 3.4 gigabytes available on your MP3 player. Each song is about.4 gigabyte. How many more songs can you download onto your MP3 player? 52. SWIMMING The table shows the top three times in a swimming event at the Summer Olympics. The event consists of a team of four women swimming 1 meters each. a. Suppose the times of all four swimmers on each team were the same. For each team, how much time does it take a swimmer to swim 1 meters? Women s 4 1 Freestyle Relay Medal Country Time (seconds) Gold Australia Silver United States Bronze Netherlands b. Suppose each U.S. swimmer completed 1 meters a quarter second faster. Would the U.S. team have won the gold medal? Explain your reasoning. 98 Chapter 2 Fractions and Decimals
8 Without finding the quotient, copy and complete the statement using <, >, or = BEES To approximate the number of bees in a hive, multiply the number of bees that leave the hive in one minute by 3 and divide by.14. You count 25 bees leaving a hive in one minute. How many bees are in the hive? 58. PROBLEM SOLVING You are saving money to buy a new bicycle that costs $ You have $3 and plan to save $5 each week. Your aunt decides to give you an additional $1 each week. a. How many weeks will you have to save until you have enough money to buy the bicycle? b. How many more weeks would you have to save to buy a new bicycle that costs $23.89? Explain how you found your answer. Applesauce 3.9-ounce bowl 24-ounce jar $.52 $ PRECISION A store sells applesauce in two sizes. a. How many bowls of applesauce fit in a jar? Round your answer to the nearest hundredth. b. Explain two ways to find the better buy. c. What is the better buy? 6. The large rectangle s dimensions are three times the dimensions of the small rectangle ft a. How many times greater is the perimeter of the large rectangle compared to the perimeter of the small rectangle? 49.2 ft b. How many times greater is the area of the large rectangle compared to the area of the small rectangle? c. Are the answers to parts (a) and (b) the same? Explain why or why not. d. What happens in parts (a) and (b) if the dimensions of the large rectangle are two times the dimensions of the small rectangle? Add or subtract. Write your answer in simplest form. (Section 1.6) MULTIPLE CHOICE Melissa earns $7.4 an hour working at a grocery store. She works hours this week. How much does she earn? (Section 2.5) A $83.13 B $15.45 C $ D $154.5 Section 2.6 Dividing Decimals 99
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