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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 385 · 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 656 + 831? (a) 1300 (b) 1700 (c) 1500
  2. 2.Best estimate of 248 + 831? (a) 1200 (b) 800 (c) 1000
  3. 3.Best estimate of 93 × 48? (a) 4500 (b) 45000 (c) 450
  4. 4.Best estimate of 200 + 570? (a) 800 (b) 1000 (c) 600
  5. 5.Best estimate of 491 + 288? (a) 600 (b) 800 (c) 1000
  6. 6.Best estimate of 266 + 783? (a) 1100 (b) 900 (c) 1300
  7. 7.Best estimate of 86 × 37? (a) 36000 (b) 3600 (c) 360
  8. 8.Best estimate of 374 + 363? (a) 1000 (b) 800 (c) 600
  9. 9.Best estimate of 576 + 710? (a) 1500 (b) 1100 (c) 1300
  10. 10.Best estimate of 811 + 466? (a) 1100 (b) 1500 (c) 1300
  11. 11.Best estimate of 51 × 23? (a) 1000 (b) 10000 (c) 100
  12. 12.Best estimate of 59 × 47? (a) 30000 (b) 300 (c) 3000
  13. 13.Best estimate of 26 × 56? (a) 180 (b) 18000 (c) 1800
  14. 14.Best estimate of 298 + 737? (a) 800 (b) 1000 (c) 1200
  15. 15.Best estimate of 61 × 46? (a) 30000 (b) 300 (c) 3000
  16. 16.Best estimate of 68 × 88? (a) 630 (b) 6300 (c) 63000
  17. 17.Best estimate of 853 + 254? (a) 1000 (b) 1200 (c) 1400
  18. 18.Best estimate of 67 × 16? (a) 1400 (b) 14000 (c) 140
  19. 19.Best estimate of 28 × 77? (a) 24000 (b) 2400 (c) 240
  20. 20.Best estimate of 256 + 262? (a) 800 (b) 400 (c) 600
  21. 21.Best estimate of 406 + 460? (a) 700 (b) 900 (c) 1100
  22. 22.Best estimate of 812 + 485? (a) 1100 (b) 1300 (c) 1500
  23. 23.Best estimate of 97 × 60? (a) 60000 (b) 600 (c) 6000
  24. 24.Best estimate of 817 + 221? (a) 1000 (b) 1200 (c) 800
  25. 25.Best estimate of 220 + 651? (a) 1100 (b) 700 (c) 900
  26. 26.Best estimate of 29 × 36? (a) 1200 (b) 120 (c) 12000
  27. 27.Best estimate of 804 + 346? (a) 1300 (b) 1100 (c) 900
  28. 28.Best estimate of 56 × 63? (a) 360 (b) 36000 (c) 3600
  29. 29.Best estimate of 53 × 82? (a) 4000 (b) 40000 (c) 400
  30. 30.Best estimate of 72 × 44? (a) 2800 (b) 280 (c) 28000
  31. 31.Best estimate of 92 × 88? (a) 810 (b) 8100 (c) 81000
  32. 32.Best estimate of 254 + 127? (a) 400 (b) 600 (c) 200
  33. 33.Best estimate of 31 × 48? (a) 1500 (b) 15000 (c) 150
  34. 34.Best estimate of 96 × 56? (a) 6000 (b) 600 (c) 60000
  35. 35.Best estimate of 184 + 602? (a) 1000 (b) 600 (c) 800
  36. 36.Best estimate of 375 + 454? (a) 700 (b) 900 (c) 1100
  37. 37.Best estimate of 56 × 30? (a) 1800 (b) 180 (c) 18000
  38. 38.Best estimate of 547 + 251? (a) 1000 (b) 600 (c) 800
  39. 39.Best estimate of 595 + 362? (a) 1000 (b) 1200 (c) 800
  40. 40.Best estimate of 52 × 26? (a) 15000 (b) 150 (c) 1500

Answer key

  1. 1500
  2. 1000
  3. 4500
  4. 800
  5. 800
  6. 1100
  7. 3600
  8. 800
  9. 1300
  10. 1300
  11. 1000
  12. 3000
  13. 1800
  14. 1000
  15. 3000
  16. 6300
  17. 1200
  18. 1400
  19. 2400
  20. 600
  21. 900
  22. 1300
  23. 6000
  24. 1000
  25. 900
  26. 1200
  27. 1100
  28. 3600
  29. 4000
  30. 2800
  31. 8100
  32. 400
  33. 1500
  34. 6000
  35. 800
  36. 900
  37. 1800
  38. 800
  39. 1000
  40. 1500

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