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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 688 · 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 444 + 630? (a) 800 (b) 1200 (c) 1000
  2. 2.Best estimate of 96 × 66? (a) 70000 (b) 7000 (c) 700
  3. 3.Best estimate of 673 + 623? (a) 1500 (b) 1300 (c) 1100
  4. 4.Best estimate of 725 + 665? (a) 1400 (b) 1200 (c) 1600
  5. 5.Best estimate of 495 + 377? (a) 900 (b) 700 (c) 1100
  6. 6.Best estimate of 57 × 44? (a) 240 (b) 2400 (c) 24000
  7. 7.Best estimate of 806 + 532? (a) 1100 (b) 1300 (c) 1500
  8. 8.Best estimate of 627 + 622? (a) 1400 (b) 1200 (c) 1000
  9. 9.Best estimate of 500 + 376? (a) 900 (b) 700 (c) 1100
  10. 10.Best estimate of 781 + 648? (a) 1200 (b) 1600 (c) 1400
  11. 11.Best estimate of 43 × 63? (a) 240 (b) 2400 (c) 24000
  12. 12.Best estimate of 62 × 87? (a) 540 (b) 5400 (c) 54000
  13. 13.Best estimate of 27 × 41? (a) 120 (b) 12000 (c) 1200
  14. 14.Best estimate of 541 + 194? (a) 900 (b) 700 (c) 500
  15. 15.Best estimate of 19 × 71? (a) 1400 (b) 14000 (c) 140
  16. 16.Best estimate of 16 × 93? (a) 18000 (b) 180 (c) 1800
  17. 17.Best estimate of 67 × 39? (a) 28000 (b) 280 (c) 2800
  18. 18.Best estimate of 616 + 797? (a) 1200 (b) 1400 (c) 1600
  19. 19.Best estimate of 16 × 49? (a) 1000 (b) 10000 (c) 100
  20. 20.Best estimate of 731 + 247? (a) 700 (b) 1100 (c) 900
  21. 21.Best estimate of 48 × 76? (a) 40000 (b) 4000 (c) 400
  22. 22.Best estimate of 233 + 880? (a) 900 (b) 1100 (c) 1300
  23. 23.Best estimate of 30 × 81? (a) 2400 (b) 240 (c) 24000
  24. 24.Best estimate of 682 + 244? (a) 1100 (b) 900 (c) 700
  25. 25.Best estimate of 257 + 766? (a) 1100 (b) 900 (c) 1300
  26. 26.Best estimate of 44 × 37? (a) 16000 (b) 160 (c) 1600
  27. 27.Best estimate of 43 × 57? (a) 2400 (b) 24000 (c) 240
  28. 28.Best estimate of 848 + 574? (a) 1600 (b) 1200 (c) 1400
  29. 29.Best estimate of 391 + 672? (a) 1100 (b) 900 (c) 1300
  30. 30.Best estimate of 530 + 556? (a) 1100 (b) 900 (c) 1300
  31. 31.Best estimate of 354 + 873? (a) 1300 (b) 1500 (c) 1100
  32. 32.Best estimate of 397 + 720? (a) 900 (b) 1300 (c) 1100
  33. 33.Best estimate of 68 × 86? (a) 63000 (b) 6300 (c) 630
  34. 34.Best estimate of 57 × 19? (a) 12000 (b) 1200 (c) 120
  35. 35.Best estimate of 661 + 374? (a) 900 (b) 1100 (c) 1300
  36. 36.Best estimate of 17 × 37? (a) 800 (b) 80 (c) 8000
  37. 37.Best estimate of 427 + 317? (a) 900 (b) 700 (c) 500
  38. 38.Best estimate of 682 + 270? (a) 1200 (b) 1000 (c) 800
  39. 39.Best estimate of 41 × 59? (a) 2400 (b) 24000 (c) 240
  40. 40.Best estimate of 66 × 61? (a) 42000 (b) 420 (c) 4200

Answer key

  1. 1000
  2. 7000
  3. 1300
  4. 1400
  5. 900
  6. 2400
  7. 1300
  8. 1200
  9. 900
  10. 1400
  11. 2400
  12. 5400
  13. 1200
  14. 700
  15. 1400
  16. 1800
  17. 2800
  18. 1400
  19. 1000
  20. 900
  21. 4000
  22. 1100
  23. 2400
  24. 900
  25. 1100
  26. 1600
  27. 2400
  28. 1400
  29. 1100
  30. 1100
  31. 1300
  32. 1100
  33. 6300
  34. 1200
  35. 1100
  36. 800
  37. 700
  38. 1000
  39. 2400
  40. 4200

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