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11 Practice Lesso N 4 R O U N D W H Ole Nu M Bers U N It 1 CC04MM RPPSTG TEXT.indb 11 © Practice and Problem Solving Curriculum Associates, LLC Copying isnotpermitted. Practice Lesson 4 Round Whole Numbers Whole 4Round Lesson Practice Lesson 4 Round Whole Numbers Name: Solve. M 3 Round each number. Prerequisite: Round Three-Digit Numbers a. 689 rounded to the nearest ten is 690 . Study the example showing how to round a b. 68 rounded to the nearest hundred is 100 . three-digit number. Then solve problems 1–6. c. 945 rounded to the nearest ten is 950 . Example d. 945 rounded to the nearest hundred is 900 . Round 154 to the nearest ten. M 4 Rachel earned $164 babysitting last month. She earned $95 this month. Rachel rounded each 150 151 152 153 154 155 156 157 158 159 160 amount to the nearest $10 to estimate how much 154 is between 150 and 160. It is closer to 150. she earned. What is each amount rounded to the 154 rounded to the nearest ten is 150. nearest $10? Show your work. Round 154 to the nearest hundred. Student work will vary. Students might draw number lines, a hundreds chart, or explain in words. 100 110 120 130 140 150 160 170 180 190 200 Solution: ___________________________________$160 and $100 154 is between 100 and 200. It is closer to 200. C 5 Use the digits in the tiles to create a number that 154 rounded to the nearest hundred is 200. makes each statement true. Use each digit only once. B 1 Round 236 to the nearest ten. 1 2 3 4 5 6 7 8 9 Which tens is 236 between? Possible answer shown. 2 9 6 236 is between 230 and 240 . uuu rounded to the nearest 10 is 300. 4 8 5 rounded to the nearest 100 is 500. 240 230 uuu Unit 1Number and Operations in Base Part Ten, 1 236 is closer to than . uuu7 1 3 rounded to the nearest 100 is 700. 236 rounded to the nearest ten is 240 . C 6 There are 528 students. The school wants to order B 2 Round 236 to the nearest hundred. t-shirts for all the students. T-shirts come in packs of Which hundreds is 236 between? ten. Should the school round the number of students to the nearest ten or hundred so that each 236 is between 200 and 300 . student gets a t-shirt? Explain. 236 is closer to 200 than 300 . Round to the nearest ten. Possible explanation: When I round to the nearest ten, I round up, so there will be more shirts than students. When I round to the nearest 236 rounded to the nearest hundred is 200 . hundred, I round down, so there won’t be enough shirts. ©Curriculum Associates, LLC Copying is not permitted. Lesson 4 Round Whole Numbers 2929 3030 Lesson 4 Round Whole Numbers ©Curriculum Associates, LLC Copying is not permitted. Unit 1 Key 4/7/16 2:36PM 11 B Basic M Medium C Challenge CC04MM RPPSTG TEXT.indb 12 12 Practice and Problem Solving Numbers Whole 4Round Lesson Practice Lesson 4 Name: Solve. Round Whole Numbers M 3 Round 452,906 to each place given below. Study the example showing how to round multi-digit a. to the nearest hundred thousand 500,000 numbers to estimate a sum. Then solve problems 1–6. b. to the nearest ten thousand 450,000 Example c. to the nearest thousand 453,000 Round each number to the nearest thousand to d. to the nearest hundred 452,900 estimate the sum. e. to the nearest ten 452,910 246,135 1 651,970 B 4 The table below shows driving distances between U.S. Round 246,135 to the nearest thousand. cities. Round each number to the nearest hundred. Actual distance (mi) Rounded distance (mi) 246,000 247,000 Atlanta, GA to Los Angeles, CA 2,173 2,200 Los Angeles, CA to Seattle, WA 1,135 1,100 246,135 rounded to the nearest thousand is 246,000. Atlanta, GA to Chicago, IL 716 700 Round 651,970 to the nearest thousand. Chicago, IL to San Francisco, CA 2,131 2,100 M 5 Look at the table in problem 4. Lisa drove from 651,000 652,000 Atlanta to Los Angeles to Seattle. Alex drove from 651,970 rounded to the nearest thousand is 652,000. Atlanta to Chicago to San Francisco. Use the rounded numbers to show who drove farther and 246,000 1 652,000 5 898,000 by about how many miles. Show your work. B 1 Look at the example above. Estimate the sum by Lisa: 2,200 1 1,100 5 3,300 rounding each number to the nearest hundred Alex: 700 1 2,100 5 2,800 3,300 2 2,800 5 500 © thousand. Write the number sentence. Curriculum Associates, LLC Copying isnotpermitted. Solution: Lisa drove about 500 miles more than Alex. 200,000 1 700,000 5 900,000 6 Write numbers in the boxes below to show Possible answer shown. Box 1 and 3 2 Round 45,621 to each place given below. C B rounding on a number line. What place value should be the same number. Box 2 is 8. Unit 1Number and Operations in Base Part Ten, 1 a. to the nearest ten 45,620 are you rounding to? Box 4 is 4. The number in Box 5 is 1 digit greater than Box 1. b. to the nearest hundred 45,600 c. to the nearest thousand 46,000 8 2 0,000 8 2 4 ,000 8 3 0,000 d. to the nearest ten thousand 50,000 Solution: Rounding to the nearest ten thousand. ©Curriculum Associates, LLC Copying is not permitted. Lesson 4 Round Whole Numbers 3131 3232 Lesson 4 Round Whole Numbers ©Curriculum Associates, LLC Copying is not permitted. Unit 1 4/7/16 2:36PM CC04MM RPPSTG TEXT.indb 13 © Practice and Problem Solving Curriculum Associates, LLC Copying isnotpermitted. Practice Lesson 4 Round Whole Numbers Whole 4Round Lesson Practice Lesson 4 Name: Solve. Round Whole Numbers Solve the problems. M 4 Look at the table below. Round all the numbers to the same place value to complete the sentence below. At what place value will the rounded B 1 Choose Yes or No to tell whether to round up to the Olympic Athletes numbers for female Which place value greater hundred thousand. Year City Total Female Male athletes be the should you look at? same? a. 949,500 u Yes u3 No 2008 Beijing, China 10,942 4,637 6,305 2012 London, Great Britain 10,568 4,676 5,892 b. 503,817 u Yes u3 No Each of the two Olympic games had about 11,000 c. 180,000 u Yes u No 3 total athletes, including about 5,000 female d. 352,625 u3 Yes u No athletes, and about 6,000 male athletes. M 2 Which numbers have been rounded correctly to the M 5 Debbie looked at problem 4 and rounded the nearest hundred? Circle the letter for all that apply. Which digit do you number of female athletes in 2008 to 5,000. She What place value look at in each rounded the number of female athletes in 2012 to were the numbers A 38,753 38,800 number to round to 4,700. She said that there were about 300 more rounded to? the nearest B 38,503 39,000 female athletes in 2008. Explain why Debbie’s hundred? estimate is incorrect and fi nd a correct estimate. C 38,910 38,900 Possible explanation: Debbie rounded one number to the nearest D 38,960 39,000 thousand and the other to the nearest hundred. She should round both to E 38,109 38,110 the same place value and then subtract. 4,680 2 4,640 5 40. There were about 40 more female athletes. M 3 A company spent $850,290 on advertising last year. Unit 1Number and Operations in Base Part Ten, 1 The company spent $872,650 this year. Which of the What do you do first to solve this following is the best estimate of how much more 6 In season one of S i n g O ff , 16,865 people tried out. In problem? C the company spent this year? season two, 5,296 more people tried out. In season What place values three, 1,834 fewer people tried out than in season can you choose to A $100,000 C $22,000 round to? two. Show two diff erent ways to round and estimate B $30,000 D $22,400 the number of people who tried out in season three. Tyson chose D as the correct answer. Explain how he Show your work. got his answer. Student work should show two of three ways to round. Answers will vary. Possible answer: Tyson rounded each number to the Round to tens: 16,870 1 5,300 5 22,170 22,170 2 1,830 5 20,340 Round to hundreds: 16,900 1 5,300 5 22,200 22,200 2 1,800 5 20,400 nearest hundred and subtracted. 872,700 2 850,300 5 22,400 Round to thousands: 17,000 1 5,000 5 22,000 22,000 2 2,000 5 20,000 Solution: ___________________________________20,340 or 20,400 or 20,000 ©Curriculum Associates, LLC Copying is not permitted. Lesson 4 Round Whole Numbers 3333 3434 Lesson 4 Round Whole Numbers ©Curriculum Associates, LLC Copying is not permitted. Unit 1 4/7/16 2:36PM 13.
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