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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 33 · 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 870 + 822? (a) 1900 (b) 1700 (c) 1500
  2. 2.Best estimate of 76 × 56? (a) 4800 (b) 480 (c) 48000
  3. 3.Best estimate of 26 × 12? (a) 300 (b) 30 (c) 3000
  4. 4.Best estimate of 43 × 53? (a) 2000 (b) 200 (c) 20000
  5. 5.Best estimate of 29 × 54? (a) 15000 (b) 150 (c) 1500
  6. 6.Best estimate of 63 × 58? (a) 360 (b) 3600 (c) 36000
  7. 7.Best estimate of 724 + 857? (a) 1600 (b) 1800 (c) 1400
  8. 8.Best estimate of 61 × 53? (a) 30000 (b) 300 (c) 3000
  9. 9.Best estimate of 12 × 77? (a) 80 (b) 8000 (c) 800
  10. 10.Best estimate of 62 × 14? (a) 600 (b) 6000 (c) 60
  11. 11.Best estimate of 662 + 460? (a) 1400 (b) 1000 (c) 1200
  12. 12.Best estimate of 46 × 14? (a) 50 (b) 5000 (c) 500
  13. 13.Best estimate of 664 + 125? (a) 600 (b) 1000 (c) 800
  14. 14.Best estimate of 593 + 235? (a) 600 (b) 1000 (c) 800
  15. 15.Best estimate of 86 × 36? (a) 360 (b) 36000 (c) 3600
  16. 16.Best estimate of 469 + 483? (a) 800 (b) 1200 (c) 1000
  17. 17.Best estimate of 96 × 18? (a) 2000 (b) 20000 (c) 200
  18. 18.Best estimate of 42 × 56? (a) 24000 (b) 240 (c) 2400
  19. 19.Best estimate of 194 + 282? (a) 700 (b) 300 (c) 500
  20. 20.Best estimate of 763 + 636? (a) 1400 (b) 1200 (c) 1600
  21. 21.Best estimate of 40 × 71? (a) 280 (b) 2800 (c) 28000
  22. 22.Best estimate of 18 × 78? (a) 160 (b) 16000 (c) 1600
  23. 23.Best estimate of 54 × 22? (a) 1000 (b) 100 (c) 10000
  24. 24.Best estimate of 32 × 83? (a) 2400 (b) 24000 (c) 240
  25. 25.Best estimate of 854 + 534? (a) 1400 (b) 1600 (c) 1200
  26. 26.Best estimate of 74 × 79? (a) 560 (b) 56000 (c) 5600
  27. 27.Best estimate of 69 × 18? (a) 1400 (b) 140 (c) 14000
  28. 28.Best estimate of 570 + 417? (a) 1000 (b) 800 (c) 1200
  29. 29.Best estimate of 19 × 72? (a) 14000 (b) 1400 (c) 140
  30. 30.Best estimate of 22 × 96? (a) 200 (b) 2000 (c) 20000
  31. 31.Best estimate of 38 × 38? (a) 16000 (b) 160 (c) 1600
  32. 32.Best estimate of 559 + 516? (a) 1300 (b) 1100 (c) 900
  33. 33.Best estimate of 471 + 751? (a) 1300 (b) 1100 (c) 1500
  34. 34.Best estimate of 152 + 845? (a) 800 (b) 1200 (c) 1000
  35. 35.Best estimate of 66 × 91? (a) 630 (b) 6300 (c) 63000
  36. 36.Best estimate of 27 × 97? (a) 30000 (b) 300 (c) 3000
  37. 37.Best estimate of 208 + 389? (a) 600 (b) 800 (c) 400
  38. 38.Best estimate of 20 × 23? (a) 4000 (b) 400 (c) 40
  39. 39.Best estimate of 16 × 19? (a) 40 (b) 4000 (c) 400
  40. 40.Best estimate of 86 × 34? (a) 2700 (b) 27000 (c) 270

Answer key

  1. 1700
  2. 4800
  3. 300
  4. 2000
  5. 1500
  6. 3600
  7. 1600
  8. 3000
  9. 800
  10. 600
  11. 1200
  12. 500
  13. 800
  14. 800
  15. 3600
  16. 1000
  17. 2000
  18. 2400
  19. 500
  20. 1400
  21. 2800
  22. 1600
  23. 1000
  24. 2400
  25. 1400
  26. 5600
  27. 1400
  28. 1000
  29. 1400
  30. 2000
  31. 1600
  32. 1100
  33. 1300
  34. 1000
  35. 6300
  36. 3000
  37. 600
  38. 400
  39. 400
  40. 2700

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