Decimal Computation Chapter Questions

Transcription

1 Decimal Computation Chapter Questions 1. Explain how to complete long division 2. What are the steps for adding decimals? 3. What are the steps for subtracting decimals? 4. What happens when you divide decimals? NJ Center for Teaching and Learning ~ 1 ~

2 Long Division Classwork 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) Chapter Problems 11) Bryan bought 4 bags of peanuts from the grocery store. Each bag of has the same number of peanuts. If Bryan bought a total of 564 peanuts, how many peanuts come in each bag? 12) Clara slept for a total of 126 hours over the course of two weeks. If she sleeps for the same amount of time each night, how many hours does she sleep per night? Homework 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) NJ Center for Teaching and Learning ~ 2 ~

3 23) Delia had several packages of jellybeans. She opened them all and had 684 jellybeans. If each package has 76 jellybeans, how many packages of jellybeans did she open? 24) Max rides his bike the same distance every day. Over the course of three weeks, he biked 84 miles. How many miles did he bike each day? Adding Decimals Classwork 25) ) ) ) ) ) ) ) ) ) ) Sandra loves red licorice rope. She has one piece that is cm long, another that is cm, and a third that is cm long. How much licorice does she have all together? 36) A recipe calls for 0.55 ml of vanilla extract, 1.05 ml of almond extract, and 0.75 ml of mint extract. How much extract does the recipe require? Homework 37) ) ) ) ) ) ) ) ) NJ Center for Teaching and Learning ~ 3 ~

4 46) ) Charles and his friends are building a model train track. Charles has 12.5 m of railway track. His friend Michael has 8.6 m, and his friend Kristy has 4.8 m. When they put their track together what will the total length be? 48) For Mother s Day, Sophia buys her mom a bunch of flowers for $12.95, and box of chocolates for $3.95, and a card for $1.78. How much did she spend? Subtracting Decimals Classwork 49) ) ) ) ) ) ) ) ) ) ) If your weekly salary is $520, how much do you take home each week after deductions are made for taxes of $82.14, $9.77, $31.35 and $41.25? 60) Franklin spent $37.46 at the grocery store. The cashier gave him $2.54 in change from a $50 bill. What did the cashier do wrong? 61) Tara wanted to buy a DVD player for $49.95, a DVD case for $19.95 and a Blu- Ray player for $ Does she have enough money to buy all three items if she has $215 with her? Homework 62) ) ) ) NJ Center for Teaching and Learning ~ 4 ~

5 66) ) ) ) ) ) ) If your monthly salary is $1600, how much do you take home each week after deductions are made for taxes of $324.58, $43.15, $ and $207.54? 73) Sam spent $76.56 at the electronics store. The cashier gave him $33.44 in change from a $100 bill. What did the cashier do wrong? 74) Tom wanted to buy a stereo for $ and 2 DVDs for $19.95 each. Does he have enough money to buy all three items if he has $200 with him? Multiplying Decimals Classwork 75) 366 x ) 4.09 x ) 9.7 x ) 4.6 x ) 0.42 x ) x ) 43.8 x ) 5.09 x ) 7.28 x ) x ) If peanuts cost $6.59 a pound, how much would it cost to buy three and a half pounds of peanuts? 86) You need to buy 7 notebooks that cost $0.74 each. How much will this cost? Homework 87) 0.05 x ) x ) 0.51 x 0.13 NJ Center for Teaching and Learning ~ 5 ~

6 90) 39.3 x ) 8.36 x ) x ) x ) x ) x ) x ) If candy cost $5.99 a pound, how much would it cost to buy four and a quarter pounds of candy? 98) You need to buy 5 books that cost $12.99 each. How much will this cost? Dividing Decimals Classwork 99) ) ) ) ) ) ) ) ) ) ) How much gas can you buy with $20 if it costs $2.39 per gallon? 110) Jen studied for 16.1 hours over a period of 3.5 days. On average, how much did she study each day? Homework 111) ) ) ) ) NJ Center for Teaching and Learning ~ 6 ~

7 116) ) ) ) ) ) Paint costs $24.99 a gallon. How much paint can he buy if he has $90, how many gallons can he buy? 122) How much gas can you buy with $30 if it costs $2.33 per gallon? Unit Review Decimal Computation Multiple Choice Questions 123) a b c d ) a b c d ) a b c d ) a b c d ) a b c d ) a b c d NJ Center for Teaching and Learning ~ 7 ~

8 129) 4.25 x 0.96 a. 408 b c d ) a b c d ) 535 x 9.84 a b c d ) a b c. 352 d ) 72.3 x a b c d ) a b c d ) a b c d Decimal Computation Short Constructed Response Questions 136) = 137) = 138) x = 139) = 140) = NJ Center for Teaching and Learning ~ 8 ~

9 Decimal Computation Extended Constructed Response Questions 141) Stephanie purchased a sweater for $57.98, including tax. She gave the cashier one $20 bill, three $10 bills, one $5 bill, six quarters, eleven dimes, and eight nickels. a. How much money did Stephanie give to the cashier? b. How much change will Stephanie receive from the cashier? c. Show all of your work to support your answers. 142) Kyle is mailing three packages to a friend. The packages weigh 3.4 pounds, 8.6 pounds, and 14 pounds. Postage will cost $1.35 per pound. a. Find the total weight of the three packages. b. Find the total cost of mailing all three packages. c. Show all of your work to support your answers. 143) Sean wants to find a summer job. He was offered a job at a local restaurant where he will make $150 per week. He was also offered a job working for a landscaping company for $7.50 per hour for 8 hours per day, three days per week. a. Determine the amount Sean will make per week at each job. b. Describe which place Sean should choose to work and explain why. c. Show all of your work to support your answers. 144) Melanie went away on vacation and wanted to send some postcards and letters to her family about her trip. Postcards cost $0.45 to buy and send and letters cost $1.35 to buy and send. Melanie spent $6.30 on the letters and postcards that she sent. NJ Center for Teaching and Learning ~ 9 ~

10 a. Determine the number of postcards Melanie sent. b. Determine the number of letters Melanie sent. c. Show all of your work to support your answers. NJ Center for Teaching and Learning ~ 10 ~

11 Answer Key 1) 12 2) 92 3) 19 4) 44 5) 54 6) ) ) ) ) ) 141 peanuts per bag 12) 9 hours per night 13) 56 14) 14 15) 34 16) 56 17) 98 18) ) ) ) ) ) 9 packages 24) 4 miles per day 25) ) ) ) ) ) ) ) ) ) ) cm 36) 2.35 ml 37) ) ) ) ) ) ) ) ) ) NJ Center for Teaching and Learning ~ 11 ~

12 47) 25.9 m 48) $ ) ) ) ) ) ) ) ) ) ) ) $ ) The correct change was $ The cashier gave him $10 less than he should have. 61) No (it will cost $219.89) 62) ) ) ) ) ) ) ) ) ) ) $ ) The correct change was $ The cashier gave him $10 too much. 74) Yes (it will cost $199.85) 75) ) ) ) ) ) ) ) ) ) ) $23.07 (rounded) 86) $ ) ) ) ) NJ Center for Teaching and Learning ~ 12 ~

13 91) ) ) ) ) ) ) $ ) $ ) ) ) ) ) ) 105) 106) 107) 108) 109) 8.37 gallons 110) 4.6 hours p/day 111) ) ) ) ) ) 117) 118) 119) 120) 121) $ ) gallons Decimal Computation Multiple Choice Questions Answer Key 123) d 124) b 125) a 126) b 127) c 128) a 129) d 130) c 131) a 132) a 133) a 134) d 135) c NJ Center for Teaching and Learning ~ 13 ~

14 Decimal Computation Short Constructed Response Questions Answer Key 136) ) ) ) ) Decimal Computation Extended Constructed Response Questions Answer Key 141. $ x $10 + $5 + 6 x $ x $ x $0.05 = $58 was given to the cashier. b. $ $57.98 = $0.02 Stephanie should receive $0.02 in change from the cashier a = 26 pounds b. 26 x $1.35 = $ $150 at the restaurant, $7.50 x 8 x 3 = $180 at the landscaping company b. Sean should work at the landscaping company because he makes $30 more per week there than at the restaurant a. 5 x $0.45= $2.25, 5 postcards b. 3 x $1.35 = $4.05, 3 letters; $ $4.05 = $6.30 NJ Center for Teaching and Learning ~ 14 ~