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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 537 · 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 80 × 72? (a) 56000 (b) 5600 (c) 560
  2. 2.Best estimate of 46 × 39? (a) 2000 (b) 20000 (c) 200
  3. 3.Best estimate of 313 + 820? (a) 900 (b) 1300 (c) 1100
  4. 4.Best estimate of 83 × 21? (a) 1600 (b) 160 (c) 16000
  5. 5.Best estimate of 18 × 83? (a) 160 (b) 1600 (c) 16000
  6. 6.Best estimate of 829 + 273? (a) 1100 (b) 1300 (c) 900
  7. 7.Best estimate of 12 × 56? (a) 6000 (b) 60 (c) 600
  8. 8.Best estimate of 676 + 739? (a) 1400 (b) 1200 (c) 1600
  9. 9.Best estimate of 77 × 88? (a) 7200 (b) 72000 (c) 720
  10. 10.Best estimate of 615 + 715? (a) 1500 (b) 1100 (c) 1300
  11. 11.Best estimate of 654 + 824? (a) 1500 (b) 1300 (c) 1700
  12. 12.Best estimate of 525 + 716? (a) 1200 (b) 1400 (c) 1000
  13. 13.Best estimate of 848 + 753? (a) 1400 (b) 1600 (c) 1800
  14. 14.Best estimate of 83 × 50? (a) 40000 (b) 4000 (c) 400
  15. 15.Best estimate of 230 + 211? (a) 200 (b) 600 (c) 400
  16. 16.Best estimate of 70 × 40? (a) 28000 (b) 2800 (c) 280
  17. 17.Best estimate of 543 + 796? (a) 1300 (b) 1500 (c) 1100
  18. 18.Best estimate of 50 × 71? (a) 3500 (b) 35000 (c) 350
  19. 19.Best estimate of 28 × 93? (a) 27000 (b) 2700 (c) 270
  20. 20.Best estimate of 573 + 346? (a) 700 (b) 900 (c) 1100
  21. 21.Best estimate of 170 + 710? (a) 1100 (b) 900 (c) 700
  22. 22.Best estimate of 36 × 82? (a) 320 (b) 32000 (c) 3200
  23. 23.Best estimate of 407 + 792? (a) 1400 (b) 1200 (c) 1000
  24. 24.Best estimate of 848 + 860? (a) 1500 (b) 1900 (c) 1700
  25. 25.Best estimate of 541 + 615? (a) 1100 (b) 900 (c) 1300
  26. 26.Best estimate of 29 × 88? (a) 27000 (b) 2700 (c) 270
  27. 27.Best estimate of 50 × 41? (a) 200 (b) 20000 (c) 2000
  28. 28.Best estimate of 407 + 496? (a) 900 (b) 700 (c) 1100
  29. 29.Best estimate of 78 × 72? (a) 5600 (b) 56000 (c) 560
  30. 30.Best estimate of 80 × 22? (a) 1600 (b) 160 (c) 16000
  31. 31.Best estimate of 36 × 86? (a) 36000 (b) 360 (c) 3600
  32. 32.Best estimate of 486 + 389? (a) 1100 (b) 700 (c) 900
  33. 33.Best estimate of 49 × 79? (a) 4000 (b) 400 (c) 40000
  34. 34.Best estimate of 175 + 322? (a) 500 (b) 300 (c) 700
  35. 35.Best estimate of 93 × 26? (a) 2700 (b) 27000 (c) 270
  36. 36.Best estimate of 156 + 681? (a) 900 (b) 700 (c) 1100
  37. 37.Best estimate of 655 + 564? (a) 1100 (b) 1500 (c) 1300
  38. 38.Best estimate of 90 × 36? (a) 36000 (b) 3600 (c) 360
  39. 39.Best estimate of 87 × 86? (a) 810 (b) 81000 (c) 8100
  40. 40.Best estimate of 212 + 210? (a) 400 (b) 600 (c) 200

Answer key

  1. 5600
  2. 2000
  3. 1100
  4. 1600
  5. 1600
  6. 1100
  7. 600
  8. 1400
  9. 7200
  10. 1300
  11. 1500
  12. 1200
  13. 1600
  14. 4000
  15. 400
  16. 2800
  17. 1300
  18. 3500
  19. 2700
  20. 900
  21. 900
  22. 3200
  23. 1200
  24. 1700
  25. 1100
  26. 2700
  27. 2000
  28. 900
  29. 5600
  30. 1600
  31. 3600
  32. 900
  33. 4000
  34. 500
  35. 2700
  36. 900
  37. 1300
  38. 3600
  39. 8100
  40. 400

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