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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 467 · 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 52 × 16? (a) 10000 (b) 1000 (c) 100
  2. 2.Best estimate of 58 × 57? (a) 3600 (b) 360 (c) 36000
  3. 3.Best estimate of 741 + 715? (a) 1400 (b) 1200 (c) 1600
  4. 4.Best estimate of 92 × 34? (a) 27000 (b) 2700 (c) 270
  5. 5.Best estimate of 818 + 449? (a) 1200 (b) 1400 (c) 1000
  6. 6.Best estimate of 495 + 530? (a) 800 (b) 1000 (c) 1200
  7. 7.Best estimate of 561 + 309? (a) 700 (b) 900 (c) 1100
  8. 8.Best estimate of 715 + 639? (a) 1500 (b) 1100 (c) 1300
  9. 9.Best estimate of 48 × 59? (a) 30000 (b) 3000 (c) 300
  10. 10.Best estimate of 759 + 680? (a) 1300 (b) 1500 (c) 1700
  11. 11.Best estimate of 215 + 160? (a) 400 (b) 600 (c) 200
  12. 12.Best estimate of 73 × 89? (a) 63000 (b) 6300 (c) 630
  13. 13.Best estimate of 347 + 191? (a) 700 (b) 500 (c) 300
  14. 14.Best estimate of 12 × 77? (a) 800 (b) 80 (c) 8000
  15. 15.Best estimate of 794 + 834? (a) 1400 (b) 1600 (c) 1800
  16. 16.Best estimate of 651 + 711? (a) 1400 (b) 1200 (c) 1600
  17. 17.Best estimate of 722 + 603? (a) 1300 (b) 1500 (c) 1100
  18. 18.Best estimate of 218 + 710? (a) 1100 (b) 700 (c) 900
  19. 19.Best estimate of 128 + 710? (a) 1000 (b) 800 (c) 600
  20. 20.Best estimate of 69 × 18? (a) 1400 (b) 14000 (c) 140
  21. 21.Best estimate of 559 + 852? (a) 1700 (b) 1500 (c) 1300
  22. 22.Best estimate of 165 + 536? (a) 700 (b) 900 (c) 500
  23. 23.Best estimate of 680 + 592? (a) 1100 (b) 1500 (c) 1300
  24. 24.Best estimate of 193 + 479? (a) 700 (b) 900 (c) 500
  25. 25.Best estimate of 69 × 17? (a) 140 (b) 14000 (c) 1400
  26. 26.Best estimate of 812 + 652? (a) 1300 (b) 1700 (c) 1500
  27. 27.Best estimate of 376 + 508? (a) 1100 (b) 900 (c) 700
  28. 28.Best estimate of 690 + 595? (a) 1500 (b) 1100 (c) 1300
  29. 29.Best estimate of 859 + 379? (a) 1300 (b) 1500 (c) 1100
  30. 30.Best estimate of 396 + 662? (a) 900 (b) 1100 (c) 1300
  31. 31.Best estimate of 14 × 50? (a) 50 (b) 5000 (c) 500
  32. 32.Best estimate of 69 × 16? (a) 14000 (b) 140 (c) 1400
  33. 33.Best estimate of 189 + 705? (a) 1100 (b) 700 (c) 900
  34. 34.Best estimate of 438 + 481? (a) 900 (b) 700 (c) 1100
  35. 35.Best estimate of 22 × 23? (a) 4000 (b) 40 (c) 400
  36. 36.Best estimate of 200 + 130? (a) 300 (b) 100 (c) 500
  37. 37.Best estimate of 706 + 130? (a) 800 (b) 600 (c) 1000
  38. 38.Best estimate of 91 × 86? (a) 810 (b) 8100 (c) 81000
  39. 39.Best estimate of 53 × 92? (a) 4500 (b) 450 (c) 45000
  40. 40.Best estimate of 37 × 96? (a) 40000 (b) 4000 (c) 400

Answer key

  1. 1000
  2. 3600
  3. 1400
  4. 2700
  5. 1200
  6. 1000
  7. 900
  8. 1300
  9. 3000
  10. 1500
  11. 400
  12. 6300
  13. 500
  14. 800
  15. 1600
  16. 1400
  17. 1300
  18. 900
  19. 800
  20. 1400
  21. 1500
  22. 700
  23. 1300
  24. 700
  25. 1400
  26. 1500
  27. 900
  28. 1300
  29. 1300
  30. 1100
  31. 500
  32. 1400
  33. 900
  34. 900
  35. 400
  36. 300
  37. 800
  38. 8100
  39. 4500
  40. 4000

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