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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 935 · 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 756 + 358? (a) 1400 (b) 1000 (c) 1200
  2. 2.Best estimate of 16 × 50? (a) 10000 (b) 1000 (c) 100
  3. 3.Best estimate of 313 + 836? (a) 1100 (b) 1300 (c) 900
  4. 4.Best estimate of 470 + 285? (a) 800 (b) 600 (c) 1000
  5. 5.Best estimate of 406 + 837? (a) 1400 (b) 1200 (c) 1000
  6. 6.Best estimate of 800 + 426? (a) 1000 (b) 1400 (c) 1200
  7. 7.Best estimate of 647 + 444? (a) 800 (b) 1000 (c) 1200
  8. 8.Best estimate of 92 × 14? (a) 90 (b) 9000 (c) 900
  9. 9.Best estimate of 221 + 262? (a) 300 (b) 700 (c) 500
  10. 10.Best estimate of 181 + 296? (a) 700 (b) 300 (c) 500
  11. 11.Best estimate of 56 × 67? (a) 42000 (b) 4200 (c) 420
  12. 12.Best estimate of 60 × 26? (a) 18000 (b) 180 (c) 1800
  13. 13.Best estimate of 44 × 43? (a) 16000 (b) 160 (c) 1600
  14. 14.Best estimate of 33 × 34? (a) 900 (b) 90 (c) 9000
  15. 15.Best estimate of 243 + 722? (a) 900 (b) 700 (c) 1100
  16. 16.Best estimate of 834 + 742? (a) 1300 (b) 1700 (c) 1500
  17. 17.Best estimate of 71 × 49? (a) 3500 (b) 35000 (c) 350
  18. 18.Best estimate of 862 + 461? (a) 1600 (b) 1200 (c) 1400
  19. 19.Best estimate of 20 × 68? (a) 14000 (b) 140 (c) 1400
  20. 20.Best estimate of 727 + 191? (a) 1100 (b) 700 (c) 900
  21. 21.Best estimate of 56 × 96? (a) 600 (b) 60000 (c) 6000
  22. 22.Best estimate of 69 × 71? (a) 49000 (b) 490 (c) 4900
  23. 23.Best estimate of 355 + 409? (a) 1000 (b) 800 (c) 600
  24. 24.Best estimate of 98 × 66? (a) 70000 (b) 7000 (c) 700
  25. 25.Best estimate of 493 + 591? (a) 900 (b) 1300 (c) 1100
  26. 26.Best estimate of 762 + 308? (a) 900 (b) 1300 (c) 1100
  27. 27.Best estimate of 326 + 233? (a) 300 (b) 700 (c) 500
  28. 28.Best estimate of 228 + 815? (a) 1200 (b) 1000 (c) 800
  29. 29.Best estimate of 317 + 863? (a) 1200 (b) 1400 (c) 1000
  30. 30.Best estimate of 209 + 405? (a) 600 (b) 800 (c) 400
  31. 31.Best estimate of 813 + 396? (a) 1400 (b) 1200 (c) 1000
  32. 32.Best estimate of 68 × 22? (a) 14000 (b) 1400 (c) 140
  33. 33.Best estimate of 72 × 16? (a) 14000 (b) 1400 (c) 140
  34. 34.Best estimate of 81 × 52? (a) 4000 (b) 40000 (c) 400
  35. 35.Best estimate of 34 × 17? (a) 60 (b) 6000 (c) 600
  36. 36.Best estimate of 210 + 562? (a) 600 (b) 800 (c) 1000
  37. 37.Best estimate of 59 × 46? (a) 300 (b) 30000 (c) 3000
  38. 38.Best estimate of 596 + 332? (a) 700 (b) 1100 (c) 900
  39. 39.Best estimate of 32 × 96? (a) 3000 (b) 300 (c) 30000
  40. 40.Best estimate of 21 × 96? (a) 20000 (b) 200 (c) 2000

Answer key

  1. 1200
  2. 1000
  3. 1100
  4. 800
  5. 1200
  6. 1200
  7. 1000
  8. 900
  9. 500
  10. 500
  11. 4200
  12. 1800
  13. 1600
  14. 900
  15. 900
  16. 1500
  17. 3500
  18. 1400
  19. 1400
  20. 900
  21. 6000
  22. 4900
  23. 800
  24. 7000
  25. 1100
  26. 1100
  27. 500
  28. 1000
  29. 1200
  30. 600
  31. 1200
  32. 1400
  33. 1400
  34. 4000
  35. 600
  36. 800
  37. 3000
  38. 900
  39. 3000
  40. 2000

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