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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 712 · 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 87 × 84? (a) 72000 (b) 7200 (c) 720
  2. 2.Best estimate of 352 + 599? (a) 1200 (b) 800 (c) 1000
  3. 3.Best estimate of 207 + 225? (a) 400 (b) 600 (c) 200
  4. 4.Best estimate of 72 × 36? (a) 280 (b) 28000 (c) 2800
  5. 5.Best estimate of 657 + 575? (a) 1100 (b) 1500 (c) 1300
  6. 6.Best estimate of 599 + 615? (a) 1400 (b) 1200 (c) 1000
  7. 7.Best estimate of 88 × 18? (a) 180 (b) 18000 (c) 1800
  8. 8.Best estimate of 76 × 36? (a) 32000 (b) 3200 (c) 320
  9. 9.Best estimate of 96 × 16? (a) 200 (b) 2000 (c) 20000
  10. 10.Best estimate of 562 + 580? (a) 1000 (b) 1200 (c) 1400
  11. 11.Best estimate of 76 × 20? (a) 160 (b) 1600 (c) 16000
  12. 12.Best estimate of 12 × 66? (a) 700 (b) 7000 (c) 70
  13. 13.Best estimate of 803 + 776? (a) 1600 (b) 1800 (c) 1400
  14. 14.Best estimate of 29 × 29? (a) 900 (b) 90 (c) 9000
  15. 15.Best estimate of 58 × 53? (a) 3000 (b) 300 (c) 30000
  16. 16.Best estimate of 174 + 154? (a) 200 (b) 400 (c) 600
  17. 17.Best estimate of 789 + 316? (a) 900 (b) 1100 (c) 1300
  18. 18.Best estimate of 44 × 60? (a) 24000 (b) 240 (c) 2400
  19. 19.Best estimate of 41 × 13? (a) 400 (b) 40 (c) 4000
  20. 20.Best estimate of 662 + 813? (a) 1700 (b) 1300 (c) 1500
  21. 21.Best estimate of 590 + 272? (a) 900 (b) 700 (c) 1100
  22. 22.Best estimate of 727 + 292? (a) 1200 (b) 1000 (c) 800
  23. 23.Best estimate of 67 × 21? (a) 14000 (b) 1400 (c) 140
  24. 24.Best estimate of 19 × 24? (a) 4000 (b) 40 (c) 400
  25. 25.Best estimate of 128 + 322? (a) 600 (b) 400 (c) 200
  26. 26.Best estimate of 22 × 54? (a) 10000 (b) 100 (c) 1000
  27. 27.Best estimate of 759 + 440? (a) 1200 (b) 1400 (c) 1000
  28. 28.Best estimate of 21 × 66? (a) 1400 (b) 14000 (c) 140
  29. 29.Best estimate of 516 + 770? (a) 1500 (b) 1100 (c) 1300
  30. 30.Best estimate of 31 × 44? (a) 12000 (b) 120 (c) 1200
  31. 31.Best estimate of 267 + 345? (a) 400 (b) 600 (c) 800
  32. 32.Best estimate of 874 + 303? (a) 1000 (b) 1200 (c) 1400
  33. 33.Best estimate of 59 × 22? (a) 1200 (b) 12000 (c) 120
  34. 34.Best estimate of 42 × 40? (a) 160 (b) 1600 (c) 16000
  35. 35.Best estimate of 757 + 395? (a) 1000 (b) 1400 (c) 1200
  36. 36.Best estimate of 36 × 90? (a) 3600 (b) 36000 (c) 360
  37. 37.Best estimate of 154 + 168? (a) 600 (b) 400 (c) 200
  38. 38.Best estimate of 22 × 21? (a) 4000 (b) 400 (c) 40
  39. 39.Best estimate of 470 + 307? (a) 800 (b) 1000 (c) 600
  40. 40.Best estimate of 468 + 638? (a) 1300 (b) 900 (c) 1100

Answer key

  1. 7200
  2. 1000
  3. 400
  4. 2800
  5. 1300
  6. 1200
  7. 1800
  8. 3200
  9. 2000
  10. 1200
  11. 1600
  12. 700
  13. 1600
  14. 900
  15. 3000
  16. 400
  17. 1100
  18. 2400
  19. 400
  20. 1500
  21. 900
  22. 1000
  23. 1400
  24. 400
  25. 400
  26. 1000
  27. 1200
  28. 1400
  29. 1300
  30. 1200
  31. 600
  32. 1200
  33. 1200
  34. 1600
  35. 1200
  36. 3600
  37. 400
  38. 400
  39. 800
  40. 1100

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