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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 677 · 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 56 × 48? (a) 30000 (b) 3000 (c) 300
  2. 2.Best estimate of 52 × 36? (a) 2000 (b) 20000 (c) 200
  3. 3.Best estimate of 188 + 294? (a) 500 (b) 700 (c) 300
  4. 4.Best estimate of 435 + 542? (a) 900 (b) 700 (c) 1100
  5. 5.Best estimate of 201 + 249? (a) 400 (b) 200 (c) 600
  6. 6.Best estimate of 782 + 194? (a) 1200 (b) 800 (c) 1000
  7. 7.Best estimate of 77 × 53? (a) 400 (b) 40000 (c) 4000
  8. 8.Best estimate of 137 + 143? (a) 200 (b) 0 (c) 400
  9. 9.Best estimate of 36 × 88? (a) 3600 (b) 360 (c) 36000
  10. 10.Best estimate of 217 + 491? (a) 700 (b) 900 (c) 500
  11. 11.Best estimate of 277 + 346? (a) 600 (b) 400 (c) 800
  12. 12.Best estimate of 17 × 31? (a) 600 (b) 6000 (c) 60
  13. 13.Best estimate of 762 + 585? (a) 1200 (b) 1400 (c) 1600
  14. 14.Best estimate of 28 × 97? (a) 3000 (b) 300 (c) 30000
  15. 15.Best estimate of 813 + 430? (a) 1200 (b) 1000 (c) 1400
  16. 16.Best estimate of 781 + 639? (a) 1400 (b) 1600 (c) 1200
  17. 17.Best estimate of 84 × 84? (a) 6400 (b) 640 (c) 64000
  18. 18.Best estimate of 66 × 86? (a) 630 (b) 63000 (c) 6300
  19. 19.Best estimate of 434 + 295? (a) 900 (b) 500 (c) 700
  20. 20.Best estimate of 28 × 69? (a) 21000 (b) 210 (c) 2100
  21. 21.Best estimate of 67 × 60? (a) 420 (b) 42000 (c) 4200
  22. 22.Best estimate of 393 + 746? (a) 900 (b) 1300 (c) 1100
  23. 23.Best estimate of 68 × 72? (a) 4900 (b) 49000 (c) 490
  24. 24.Best estimate of 66 × 31? (a) 21000 (b) 210 (c) 2100
  25. 25.Best estimate of 66 × 76? (a) 560 (b) 5600 (c) 56000
  26. 26.Best estimate of 478 + 855? (a) 1400 (b) 1200 (c) 1600
  27. 27.Best estimate of 68 × 12? (a) 7000 (b) 70 (c) 700
  28. 28.Best estimate of 617 + 214? (a) 600 (b) 1000 (c) 800
  29. 29.Best estimate of 63 × 19? (a) 12000 (b) 120 (c) 1200
  30. 30.Best estimate of 404 + 296? (a) 900 (b) 700 (c) 500
  31. 31.Best estimate of 659 + 269? (a) 1000 (b) 1200 (c) 800
  32. 32.Best estimate of 86 × 73? (a) 630 (b) 63000 (c) 6300
  33. 33.Best estimate of 471 + 297? (a) 600 (b) 800 (c) 1000
  34. 34.Best estimate of 73 × 94? (a) 6300 (b) 63000 (c) 630
  35. 35.Best estimate of 756 + 308? (a) 1100 (b) 900 (c) 1300
  36. 36.Best estimate of 46 × 90? (a) 450 (b) 4500 (c) 45000
  37. 37.Best estimate of 603 + 334? (a) 700 (b) 1100 (c) 900
  38. 38.Best estimate of 33 × 56? (a) 1800 (b) 180 (c) 18000
  39. 39.Best estimate of 332 + 409? (a) 500 (b) 900 (c) 700
  40. 40.Best estimate of 60 × 38? (a) 2400 (b) 240 (c) 24000

Answer key

  1. 3000
  2. 2000
  3. 500
  4. 900
  5. 400
  6. 1000
  7. 4000
  8. 200
  9. 3600
  10. 700
  11. 600
  12. 600
  13. 1400
  14. 3000
  15. 1200
  16. 1400
  17. 6400
  18. 6300
  19. 700
  20. 2100
  21. 4200
  22. 1100
  23. 4900
  24. 2100
  25. 5600
  26. 1400
  27. 700
  28. 800
  29. 1200
  30. 700
  31. 1000
  32. 6300
  33. 800
  34. 6300
  35. 1100
  36. 4500
  37. 900
  38. 1800
  39. 700
  40. 2400

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