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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 547 · 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 74 × 94? (a) 6300 (b) 630 (c) 63000
  2. 2.Best estimate of 599 + 790? (a) 1200 (b) 1400 (c) 1600
  3. 3.Best estimate of 38 × 69? (a) 2800 (b) 28000 (c) 280
  4. 4.Best estimate of 77 × 56? (a) 480 (b) 4800 (c) 48000
  5. 5.Best estimate of 754 + 880? (a) 1700 (b) 1500 (c) 1900
  6. 6.Best estimate of 160 + 835? (a) 1000 (b) 800 (c) 1200
  7. 7.Best estimate of 568 + 672? (a) 1500 (b) 1300 (c) 1100
  8. 8.Best estimate of 42 × 83? (a) 3200 (b) 32000 (c) 320
  9. 9.Best estimate of 76 × 29? (a) 24000 (b) 2400 (c) 240
  10. 10.Best estimate of 502 + 283? (a) 800 (b) 600 (c) 1000
  11. 11.Best estimate of 160 + 312? (a) 700 (b) 300 (c) 500
  12. 12.Best estimate of 22 × 96? (a) 20000 (b) 200 (c) 2000
  13. 13.Best estimate of 66 × 44? (a) 2800 (b) 280 (c) 28000
  14. 14.Best estimate of 86 × 94? (a) 81000 (b) 8100 (c) 810
  15. 15.Best estimate of 282 + 181? (a) 500 (b) 300 (c) 700
  16. 16.Best estimate of 482 + 668? (a) 1000 (b) 1200 (c) 1400
  17. 17.Best estimate of 81 × 39? (a) 320 (b) 3200 (c) 32000
  18. 18.Best estimate of 93 × 32? (a) 27000 (b) 2700 (c) 270
  19. 19.Best estimate of 468 + 498? (a) 1200 (b) 800 (c) 1000
  20. 20.Best estimate of 92 × 83? (a) 720 (b) 72000 (c) 7200
  21. 21.Best estimate of 282 + 458? (a) 600 (b) 800 (c) 1000
  22. 22.Best estimate of 513 + 602? (a) 1100 (b) 1300 (c) 900
  23. 23.Best estimate of 26 × 48? (a) 150 (b) 1500 (c) 15000
  24. 24.Best estimate of 538 + 812? (a) 1500 (b) 1300 (c) 1100
  25. 25.Best estimate of 36 × 37? (a) 160 (b) 16000 (c) 1600
  26. 26.Best estimate of 760 + 729? (a) 1500 (b) 1700 (c) 1300
  27. 27.Best estimate of 771 + 517? (a) 1500 (b) 1300 (c) 1100
  28. 28.Best estimate of 768 + 845? (a) 1400 (b) 1800 (c) 1600
  29. 29.Best estimate of 842 + 154? (a) 1200 (b) 800 (c) 1000
  30. 30.Best estimate of 52 × 36? (a) 2000 (b) 200 (c) 20000
  31. 31.Best estimate of 66 × 40? (a) 280 (b) 2800 (c) 28000
  32. 32.Best estimate of 293 + 399? (a) 900 (b) 700 (c) 500
  33. 33.Best estimate of 747 + 182? (a) 900 (b) 1100 (c) 700
  34. 34.Best estimate of 56 × 21? (a) 120 (b) 1200 (c) 12000
  35. 35.Best estimate of 53 × 38? (a) 20000 (b) 200 (c) 2000
  36. 36.Best estimate of 89 × 46? (a) 4500 (b) 45000 (c) 450
  37. 37.Best estimate of 659 + 314? (a) 1000 (b) 1200 (c) 800
  38. 38.Best estimate of 655 + 449? (a) 1100 (b) 900 (c) 1300
  39. 39.Best estimate of 212 + 712? (a) 1100 (b) 700 (c) 900
  40. 40.Best estimate of 58 × 12? (a) 6000 (b) 60 (c) 600

Answer key

  1. 6300
  2. 1400
  3. 2800
  4. 4800
  5. 1700
  6. 1000
  7. 1300
  8. 3200
  9. 2400
  10. 800
  11. 500
  12. 2000
  13. 2800
  14. 8100
  15. 500
  16. 1200
  17. 3200
  18. 2700
  19. 1000
  20. 7200
  21. 800
  22. 1100
  23. 1500
  24. 1300
  25. 1600
  26. 1500
  27. 1300
  28. 1600
  29. 1000
  30. 2000
  31. 2800
  32. 700
  33. 900
  34. 1200
  35. 2000
  36. 4500
  37. 1000
  38. 1100
  39. 900
  40. 600

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