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3 rd Grade Rounding

3 rd Grade Rounding. California Standard Addressed. Number Sense. Third Grade. 1.4 Round off numbers to 10,000 to the nearest ten, hundred, and thousand. Objectives. To be able to round numbers to the nearest ten To be able to round numbers to the nearest hundred

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3 rd Grade Rounding

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  1. 3rd GradeRounding

  2. California Standard Addressed Number Sense Third Grade 1.4 Round off numbers to 10,000 to the nearest ten, hundred, and thousand.

  3. Objectives • To be able to round numbers to the nearest ten • To be able to round numbers to the nearest hundred • To be able to round numbers to the nearest thousand

  4. Vocabulary • Round – to replace an exact number by another that is close to it in value and easier to use. For example, 52, rounded to the nearest ten is 50.

  5. Use rounding • When the question asks you • to estimate. • When the question asks • “about how many”…? • When an exact answer isn’t • possible. • When an answer is difficult to obtain.

  6. Memorize this Poem Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

  7. Round this number to the nearestten. Find your number. 5 6 Circle the number in the tens place.

  8. Round this number to the nearestten. Look right next door. 5 6 Draw an arrow to the right of the number.

  9. Round this number to the nearestten. 4 or less, just ignore. 5 6 6 is larger than 4 so go to the next line of the poem.

  10. Round this number to the nearestten. 5 or more, add 1 more. +1 5 7 Add 1 to the 4.

  11. Round this number to the nearestten. 5 or more, add 1 more. 6 0 After adding 1 to the 5, all the numbers to the right of the 6 become 0’s.

  12. The Answer 5 6 rounded to the nearest tens place is 6 0 60 50 56 Note 56 is closer to 60 on the number line.

  13. Round this number to the nearesthundred. Find your number. 9 8 6 Circle the number in the hundreds place.

  14. Round this number to the nearesthundred. Look right next door. 9 8 6 Draw an arrow to the right of the number.

  15. Round this number to the nearesthundred. 4 or less, just ignore. 9 8 6 8 is larger than 4 so go to the next line of the poem.

  16. Round this number to the nearesthundred. 5 or more, add 1 more. +1 9 8 6 Add 1 to the 9.

  17. Round this number to the nearesthundred. 5 or more, add 1 more. 1, 0 0 0 After adding 1 to the 9, all the numbers to the right of the 10 become 0’s.

  18. The Answer 986 rounded to the nearest hundreds place is 1, 0 0 0 900 986 1,000 Note 986 is closer to 1,000 on the number line.

  19. Round this number to the nearestthousand. Find your number. 3 5, 3 2 7 Circle the number in the thousands place.

  20. Round this number to the nearestthousand. Look right next door. 3 5, 3 2 7 Draw an arrow to the right of the number.

  21. Round this number to the nearestthousand. 4 or less, just ignore. 3 5, 3 2 7 Since 3 is less than 4 we do not change the 5.

  22. Round this number to the nearestthousand. 4 or less, just ignore. 3 5, 0 0 0 Change the numbers to left of 5 to 0’s.

  23. The Answer 35,327 rounded to the nearest thousand is 3 5, 0 0 0 35,000 35,327 36,000 Note 35,327 is closer to 35,000 on the number line than to 36,000.

  24. Round these numbers to the nearest ten. 1 3 9 4 5 2 8 2 9 7 1 4 0 5 0 2 8 0 1 0 0

  25. Round these numbers to the nearest hundred. 2, 1 3 9 1 9, 7 4 5 2 8 2 3, 1 9 7 2, 1 0 0 1 9, 7 0 0 3 0 0 3, 2 0 0

  26. Round these numbers to the nearest thousand. 2, 8 3 9 1 9, 4 4 5 8, 9 8 2 4 3,1 9 7 3, 0 0 0 1 9, 0 0 0 9, 0 0 0 4 3, 0 0 0

  27. Credits • Illustrations from: • Clipart from ClickArt 125,000 Deluxe Image Pak, T/Maker Co., Broderbund Software, Inc.

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