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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 97 · 40 questions
TalentJR

How to do it in your head (Round, then work): Round each number: 2-digit numbers to the nearest ten, 3-digit numbers to the nearest hundred. Do the easy sum with the round numbers. Choose the option closest to your estimate.

NameDateTime takenScore ___ / 40
  1. 1.Best estimate of 12 × 86? (a) 9000 (b) 90 (c) 900
  2. 2.Best estimate of 32 × 14? (a) 300 (b) 3000 (c) 30
  3. 3.Best estimate of 132 + 395? (a) 700 (b) 500 (c) 300
  4. 4.Best estimate of 778 + 534? (a) 1100 (b) 1500 (c) 1300
  5. 5.Best estimate of 63 × 37? (a) 2400 (b) 24000 (c) 240
  6. 6.Best estimate of 236 + 533? (a) 900 (b) 700 (c) 500
  7. 7.Best estimate of 638 + 800? (a) 1200 (b) 1400 (c) 1600
  8. 8.Best estimate of 76 × 56? (a) 4800 (b) 480 (c) 48000
  9. 9.Best estimate of 377 + 735? (a) 1300 (b) 900 (c) 1100
  10. 10.Best estimate of 47 × 26? (a) 15000 (b) 1500 (c) 150
  11. 11.Best estimate of 613 + 346? (a) 700 (b) 1100 (c) 900
  12. 12.Best estimate of 262 + 827? (a) 1300 (b) 900 (c) 1100
  13. 13.Best estimate of 13 × 69? (a) 700 (b) 70 (c) 7000
  14. 14.Best estimate of 67 × 36? (a) 28000 (b) 280 (c) 2800
  15. 15.Best estimate of 386 + 217? (a) 800 (b) 600 (c) 400
  16. 16.Best estimate of 48 × 72? (a) 35000 (b) 350 (c) 3500
  17. 17.Best estimate of 807 + 678? (a) 1300 (b) 1500 (c) 1700
  18. 18.Best estimate of 375 + 524? (a) 1100 (b) 900 (c) 700
  19. 19.Best estimate of 687 + 636? (a) 1500 (b) 1100 (c) 1300
  20. 20.Best estimate of 306 + 704? (a) 1000 (b) 800 (c) 1200
  21. 21.Best estimate of 92 × 37? (a) 3600 (b) 36000 (c) 360
  22. 22.Best estimate of 584 + 739? (a) 1500 (b) 1300 (c) 1100
  23. 23.Best estimate of 288 + 761? (a) 1300 (b) 1100 (c) 900
  24. 24.Best estimate of 718 + 251? (a) 1000 (b) 1200 (c) 800
  25. 25.Best estimate of 24 × 34? (a) 600 (b) 60 (c) 6000
  26. 26.Best estimate of 82 × 52? (a) 40000 (b) 400 (c) 4000
  27. 27.Best estimate of 56 × 96? (a) 600 (b) 6000 (c) 60000
  28. 28.Best estimate of 331 + 572? (a) 700 (b) 900 (c) 1100
  29. 29.Best estimate of 66 × 76? (a) 56000 (b) 5600 (c) 560
  30. 30.Best estimate of 12 × 92? (a) 90 (b) 900 (c) 9000
  31. 31.Best estimate of 67 × 51? (a) 35000 (b) 350 (c) 3500
  32. 32.Best estimate of 595 + 760? (a) 1600 (b) 1200 (c) 1400
  33. 33.Best estimate of 90 × 73? (a) 6300 (b) 63000 (c) 630
  34. 34.Best estimate of 754 + 286? (a) 900 (b) 1300 (c) 1100
  35. 35.Best estimate of 571 + 659? (a) 1100 (b) 1300 (c) 1500
  36. 36.Best estimate of 323 + 852? (a) 1400 (b) 1000 (c) 1200
  37. 37.Best estimate of 566 + 414? (a) 800 (b) 1200 (c) 1000
  38. 38.Best estimate of 300 + 780? (a) 900 (b) 1300 (c) 1100
  39. 39.Best estimate of 610 + 867? (a) 1300 (b) 1500 (c) 1700
  40. 40.Best estimate of 239 + 290? (a) 500 (b) 700 (c) 300

Answer key

  1. 900
  2. 300
  3. 500
  4. 1300
  5. 2400
  6. 700
  7. 1400
  8. 4800
  9. 1100
  10. 1500
  11. 900
  12. 1100
  13. 700
  14. 2800
  15. 600
  16. 3500
  17. 1500
  18. 900
  19. 1300
  20. 1000
  21. 3600
  22. 1300
  23. 1100
  24. 1000
  25. 600
  26. 4000
  27. 6000
  28. 900
  29. 5600
  30. 900
  31. 3500
  32. 1400
  33. 6300
  34. 1100
  35. 1300
  36. 1200
  37. 1000
  38. 1100
  39. 1500
  40. 500

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