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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 635 · 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 525 + 555? (a) 1100 (b) 900 (c) 1300
  2. 2.Best estimate of 269 + 796? (a) 1300 (b) 900 (c) 1100
  3. 3.Best estimate of 682 + 296? (a) 1000 (b) 1200 (c) 800
  4. 4.Best estimate of 32 × 59? (a) 180 (b) 1800 (c) 18000
  5. 5.Best estimate of 13 × 51? (a) 500 (b) 5000 (c) 50
  6. 6.Best estimate of 287 + 836? (a) 900 (b) 1300 (c) 1100
  7. 7.Best estimate of 855 + 767? (a) 1900 (b) 1500 (c) 1700
  8. 8.Best estimate of 465 + 795? (a) 1500 (b) 1300 (c) 1100
  9. 9.Best estimate of 428 + 441? (a) 600 (b) 1000 (c) 800
  10. 10.Best estimate of 97 × 72? (a) 7000 (b) 70000 (c) 700
  11. 11.Best estimate of 855 + 201? (a) 1100 (b) 1300 (c) 900
  12. 12.Best estimate of 443 + 143? (a) 300 (b) 700 (c) 500
  13. 13.Best estimate of 14 × 77? (a) 8000 (b) 800 (c) 80
  14. 14.Best estimate of 467 + 642? (a) 1100 (b) 900 (c) 1300
  15. 15.Best estimate of 848 + 205? (a) 1000 (b) 1200 (c) 800
  16. 16.Best estimate of 640 + 813? (a) 1400 (b) 1200 (c) 1600
  17. 17.Best estimate of 97 × 40? (a) 40000 (b) 4000 (c) 400
  18. 18.Best estimate of 31 × 37? (a) 12000 (b) 120 (c) 1200
  19. 19.Best estimate of 529 + 731? (a) 1200 (b) 1000 (c) 1400
  20. 20.Best estimate of 27 × 63? (a) 1800 (b) 180 (c) 18000
  21. 21.Best estimate of 74 × 77? (a) 5600 (b) 560 (c) 56000
  22. 22.Best estimate of 41 × 89? (a) 36000 (b) 3600 (c) 360
  23. 23.Best estimate of 16 × 72? (a) 1400 (b) 14000 (c) 140
  24. 24.Best estimate of 43 × 71? (a) 2800 (b) 28000 (c) 280
  25. 25.Best estimate of 678 + 169? (a) 700 (b) 900 (c) 1100
  26. 26.Best estimate of 715 + 488? (a) 1000 (b) 1200 (c) 1400
  27. 27.Best estimate of 16 × 56? (a) 1200 (b) 12000 (c) 120
  28. 28.Best estimate of 71 × 88? (a) 63000 (b) 6300 (c) 630
  29. 29.Best estimate of 793 + 778? (a) 1600 (b) 1400 (c) 1800
  30. 30.Best estimate of 80 × 73? (a) 56000 (b) 5600 (c) 560
  31. 31.Best estimate of 139 + 448? (a) 300 (b) 500 (c) 700
  32. 32.Best estimate of 88 × 68? (a) 63000 (b) 6300 (c) 630
  33. 33.Best estimate of 775 + 633? (a) 1200 (b) 1400 (c) 1600
  34. 34.Best estimate of 24 × 86? (a) 18000 (b) 180 (c) 1800
  35. 35.Best estimate of 73 × 30? (a) 2100 (b) 210 (c) 21000
  36. 36.Best estimate of 244 + 771? (a) 1000 (b) 1200 (c) 800
  37. 37.Best estimate of 339 + 837? (a) 900 (b) 1100 (c) 1300
  38. 38.Best estimate of 747 + 137? (a) 800 (b) 600 (c) 1000
  39. 39.Best estimate of 803 + 344? (a) 1100 (b) 900 (c) 1300
  40. 40.Best estimate of 96 × 53? (a) 50000 (b) 500 (c) 5000

Answer key

  1. 1100
  2. 1100
  3. 1000
  4. 1800
  5. 500
  6. 1100
  7. 1700
  8. 1300
  9. 800
  10. 7000
  11. 1100
  12. 500
  13. 800
  14. 1100
  15. 1000
  16. 1400
  17. 4000
  18. 1200
  19. 1200
  20. 1800
  21. 5600
  22. 3600
  23. 1400
  24. 2800
  25. 900
  26. 1200
  27. 1200
  28. 6300
  29. 1600
  30. 5600
  31. 500
  32. 6300
  33. 1400
  34. 1800
  35. 2100
  36. 1000
  37. 1100
  38. 800
  39. 1100
  40. 5000

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