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&&66 8VHSODFHYDOXHXQGHUVWDQGLQJWRURXQGPXOWLGLJLWZKROHQXPEHUV NS 1.1*1%7 Estimate, round, and manipulate very large (e.g., millions) and WRDQ\SODFH UNDERLYING SKILLS AND CONCEPTS: very small (e.g., thousandths) numbers. use place value; read and write numbers; use a number line Round to the Nearest 10, 100, or 1,000 I’m rounding 5,423 to the nearest 10. Rounding is one way to estimate a number. You use place value when you round. 5,420 A number line can help you. E x am p l E 5,430 Half-way is 5,425. 1 Samuel’s school had 5,423 students. What is the number of students rounded to the nearest ten? Hint: Is 5,423 closer to 5,420 or 5,430? 23 You are rounding to the nearest ten, so circle the digit in the tens place: 5,4● Go to the digit to the right of the circled digit. Underline it. 5,4● 23 E x am p l E 3!5 Closer to 5,400 or 5,500? 2 Round the number 5,428 to the nearest hundred. 4 28 Circle the digit in the hundreds place: 5,● Underline the digit to the right. 5,● 4 28 5,300 2 is less than 5, so round down. 5,428 rounded to the nearest hundred is 5,400. E x am p l E page 6 5,400 5,500 5,600 3 Round the number 1,437,621 to the nearest thousand. 1,437,621 is closer to 1,438,000. 5,428 1,437,621 1,437,000 1,437,500 is half-way between 1,438,000 Chapter 1 – Lesson 3 E – © CSL Associates, Inc. All rights reserved. If the underlined digit is less than 5, round down. If it is ≥ 5, round up. 3 is less than 5, so round down to 5,420. 5,423 rounded to the nearest ten is 5,420. Name P RAC T I C E Round each number to the nearest ten. You may use the number lines to help. 1. 45 rounds to 30 50 40 2. 145 rounds to 150 130 50 140 150 3. 6,209 6,210 4. 236,894 236,890 6. 12,875 12,880 7. 999,995 1,000,000 8. 6,204 6,200 Round each number to the nearest hundred. 9. 220 200 10. 11,278 11,300 11. 180,440 180,400 1,700 13. 22,850 22,900 14. 1,098,950 1,099,000 Round each number to the nearest thousand. 15. 501 1,000 16. 62,199 62,000 17. 3,889,704 3,890,000 12. 1,678 18. 6,916 7,000 5. 1,783,496 1,783,500 19. 1,805,500 1,806,000 20. 9,999,499 9,999,000 Solve. E – © CSL Associates, Inc. All rights reserved. 21. 62,346 people attended the Washington School football game. About 62,000 people how many people attended, to the nearest thousand? 22. A plane flew at an altitude of 35,564 feet. What is its altitude, 36,000 ft rounded to the nearest thousand? Circle the correct choice. 23. A newspaper reported that about 45,000 people attended a football game, rounded to the nearest thousand. Which could be the exact number of people at the game? A 4,489 Math Reasoning B 44,489 C 45,342 D 46,501 Rounding MR 1.1, 2.6 24. I am a four-digit number. When rounded to the nearest hundred, I am 4,900. I am 5,000 when rounded to the nearest thousand. Who am I? Any number from 4,850 to 4,949. Chapter 1 – Lesson 3 page 7 MCX94.HW.CL.G5.FM&Lesson.v211 8/2/04 18:02 Page 6 Name …at home! P RAC T I C E Round each number to the nearest ten. You may use the number lines to help. 1. 45 rounds to 30 50 2. 144 rounds to 140 40 130 50 140 150 3. 5,308 5,310 4. 147,893 147,890 5. 1,894,487 6. 14,765 14,770 7. 888,885 888,890 8. 5,309 Round each number to the nearest hundred. 9. 330 300 10. 22,389 22,400 11. 190,340 1,800 34,000 14. 2,087,850 2,087,900 12. 1,789 13. 33,960 Round each number to the nearest thousand. 15. 503 1,000 16. 73,288 18. 7,832 8,000 73,000 1,894,490 5,310 190,300 17. 3,789,804 3,790,000 19. 1,607,700 1,608,000 20. 9,989,500 9,990,000 Solve. About how many people attended, to the nearest thousand? 51,000 people 22. A plane flew at an altitude of 28,591 feet. What is its altitude, 29,000 ft rounded to the nearest thousand? Circle the correct choice. 23. A newspaper reported that about 35,000 people attended a basketball game, rounded to the nearest thousand. Which could be the exact number of people at the game? A 3,489 Math Reasoning B 34,489 C 35,342 D 36,501 Rounding MR 1.1, 2.6 24. I am a four-digit number. When rounded to the nearest hundred, I am 3,800. I am 4,000 when rounded to the nearest thousand. Who am I? Any number from 3,750 to 3,849 page 6 Home Resource and Homework Chapter 1 Lesson 3 E – © CSL Associates, Inc. All rights reserved. 21. 51,439 people attended the Lincoln School basketball game. MCX94TEG5CH01_32.v7.4.2 2/24/01 19:42 Page 15 Name P RAC T I C E Round each number to the nearest ten. You may use the number lines to help. 1. 45 rounds to 30 50 40 2. 145 rounds to 150 130 50 140 150 3. 6,209 6,210 4. 236,894 236,890 6. 12,875 12,880 7. 999,995 1,000,000 8. 6,204 6,200 Round each number to the nearest hundred. 9. 220 200 10. 11,278 11,300 11. 180,440 180,400 1,700 13. 22,850 22,900 14. 1,098,950 1,099,000 Round each number to the nearest thousand. 15. 501 1,000 16. 62,199 62,000 17. 3,889,704 3,890,000 12. 1,678 18. 6,916 7,000 5. 1,783,496 1,783,500 19. 1,805,500 1,806,000 20. 9,999,499 9,999,000 Solve. E – © CSL Associates, Inc. All rights reserved. 21. 62,346 people attended the Washington School football game. About 62,000 people how many people attended, to the nearest thousand? 22. A plane flew at an altitude of 35,564 feet. What is its altitude, 36,000 ft rounded to the nearest thousand? Circle the correct choice. 23. A newspaper reported that about 45,000 people attended a football game, rounded to the nearest thousand. Which could be the exact number of people at the game? A 4,489 Math Reasoning B 44,489 C 45,342 D 46,501 Rounding MR 1.1, 2.6 24. I am a four-digit number. When rounded to the nearest hundred, I am 4,900. I am 5,000 when rounded to the nearest thousand. Who am I? Any number from 4,850 to 4,949. Chapter 1 – Lesson 3 Student Book Page page 7 Name …at home! P RAC T I C E Round each number to the nearest ten. You may use the number lines to help. 1. 45 rounds to 30 50 2. 144 rounds to 140 40 130 50 140 150 3. 5,308 5,310 4. 147,893 147,890 5. 1,894,487 6. 14,765 14,770 7. 888,885 888,890 8. 5,309 Round each number to the nearest hundred. 9. 330 300 10. 22,389 22,400 11. 190,340 1,800 34,000 14. 2,087,850 2,087,900 12. 1,789 13. 33,960 Round each number to the nearest thousand. 15. 503 1,000 16. 73,288 18. 7,832 8,000 73,000 1,894,490 5,310 190,300 17. 3,789,804 3,790,000 19. 1,607,700 1,608,000 20. 9,989,500 9,990,000 Solve. About how many people attended, to the nearest thousand? 51,000 people 22. A plane flew at an altitude of 28,591 feet. What is its altitude, 29,000 ft rounded to the nearest thousand? Circle the correct choice. 23. A newspaper reported that about 35,000 people attended a basketball game, rounded to the nearest thousand. Which could be the exact number of people at the game? A 3,489 Math Reasoning B 34,489 C 35,342 D 36,501 Rounding MR 1.1, 2.6 24. I am a four-digit number. When rounded to the nearest hundred, I am 3,800. I am 4,000 when rounded to the nearest thousand. Who am I? Any number from 3,750 to 3,849 page 6 Home Resource and Homework Chapter 1 Lesson 3 E – © CSL Associates, Inc. All rights reserved. 21. 51,439 people attended the Lincoln School basketball game.