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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 293 · 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 52 × 69? (a) 35000 (b) 350 (c) 3500
  2. 2.Best estimate of 711 + 206? (a) 700 (b) 1100 (c) 900
  3. 3.Best estimate of 19 × 47? (a) 100 (b) 1000 (c) 10000
  4. 4.Best estimate of 868 + 801? (a) 1900 (b) 1500 (c) 1700
  5. 5.Best estimate of 463 + 414? (a) 700 (b) 1100 (c) 900
  6. 6.Best estimate of 89 × 72? (a) 63000 (b) 6300 (c) 630
  7. 7.Best estimate of 707 + 173? (a) 900 (b) 700 (c) 1100
  8. 8.Best estimate of 396 + 635? (a) 800 (b) 1000 (c) 1200
  9. 9.Best estimate of 63 × 26? (a) 18000 (b) 1800 (c) 180
  10. 10.Best estimate of 462 + 186? (a) 900 (b) 700 (c) 500
  11. 11.Best estimate of 38 × 81? (a) 32000 (b) 320 (c) 3200
  12. 12.Best estimate of 330 + 813? (a) 900 (b) 1100 (c) 1300
  13. 13.Best estimate of 609 + 857? (a) 1500 (b) 1700 (c) 1300
  14. 14.Best estimate of 36 × 31? (a) 12000 (b) 120 (c) 1200
  15. 15.Best estimate of 366 + 571? (a) 1000 (b) 1200 (c) 800
  16. 16.Best estimate of 384 + 408? (a) 800 (b) 1000 (c) 600
  17. 17.Best estimate of 698 + 301? (a) 1200 (b) 1000 (c) 800
  18. 18.Best estimate of 16 × 12? (a) 2000 (b) 200 (c) 20
  19. 19.Best estimate of 98 × 73? (a) 70000 (b) 700 (c) 7000
  20. 20.Best estimate of 61 × 38? (a) 240 (b) 2400 (c) 24000
  21. 21.Best estimate of 83 × 73? (a) 560 (b) 5600 (c) 56000
  22. 22.Best estimate of 871 + 787? (a) 1500 (b) 1700 (c) 1900
  23. 23.Best estimate of 67 × 32? (a) 210 (b) 2100 (c) 21000
  24. 24.Best estimate of 683 + 719? (a) 1600 (b) 1200 (c) 1400
  25. 25.Best estimate of 82 × 59? (a) 4800 (b) 48000 (c) 480
  26. 26.Best estimate of 855 + 452? (a) 1400 (b) 1200 (c) 1600
  27. 27.Best estimate of 22 × 86? (a) 18000 (b) 180 (c) 1800
  28. 28.Best estimate of 66 × 83? (a) 56000 (b) 560 (c) 5600
  29. 29.Best estimate of 501 + 654? (a) 1400 (b) 1200 (c) 1000
  30. 30.Best estimate of 97 × 28? (a) 30000 (b) 300 (c) 3000
  31. 31.Best estimate of 248 + 762? (a) 800 (b) 1200 (c) 1000
  32. 32.Best estimate of 63 × 39? (a) 240 (b) 24000 (c) 2400
  33. 33.Best estimate of 57 × 23? (a) 12000 (b) 120 (c) 1200
  34. 34.Best estimate of 19 × 76? (a) 160 (b) 1600 (c) 16000
  35. 35.Best estimate of 186 + 346? (a) 500 (b) 300 (c) 700
  36. 36.Best estimate of 328 + 388? (a) 900 (b) 700 (c) 500
  37. 37.Best estimate of 837 + 708? (a) 1700 (b) 1500 (c) 1300
  38. 38.Best estimate of 91 × 86? (a) 810 (b) 8100 (c) 81000
  39. 39.Best estimate of 66 × 77? (a) 5600 (b) 56000 (c) 560
  40. 40.Best estimate of 510 + 636? (a) 1100 (b) 1300 (c) 900

Answer key

  1. 3500
  2. 900
  3. 1000
  4. 1700
  5. 900
  6. 6300
  7. 900
  8. 1000
  9. 1800
  10. 700
  11. 3200
  12. 1100
  13. 1500
  14. 1200
  15. 1000
  16. 800
  17. 1000
  18. 200
  19. 7000
  20. 2400
  21. 5600
  22. 1700
  23. 2100
  24. 1400
  25. 4800
  26. 1400
  27. 1800
  28. 5600
  29. 1200
  30. 3000
  31. 1000
  32. 2400
  33. 1200
  34. 1600
  35. 500
  36. 700
  37. 1500
  38. 8100
  39. 5600
  40. 1100

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