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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 739 · 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 524 + 213? (a) 500 (b) 900 (c) 700
  2. 2.Best estimate of 603 + 177? (a) 800 (b) 1000 (c) 600
  3. 3.Best estimate of 623 + 200? (a) 800 (b) 600 (c) 1000
  4. 4.Best estimate of 797 + 169? (a) 1200 (b) 1000 (c) 800
  5. 5.Best estimate of 570 + 220? (a) 600 (b) 1000 (c) 800
  6. 6.Best estimate of 46 × 53? (a) 2500 (b) 250 (c) 25000
  7. 7.Best estimate of 82 × 74? (a) 560 (b) 5600 (c) 56000
  8. 8.Best estimate of 201 + 830? (a) 1000 (b) 1200 (c) 800
  9. 9.Best estimate of 28 × 26? (a) 900 (b) 9000 (c) 90
  10. 10.Best estimate of 49 × 70? (a) 3500 (b) 350 (c) 35000
  11. 11.Best estimate of 293 + 394? (a) 900 (b) 700 (c) 500
  12. 12.Best estimate of 22 × 34? (a) 60 (b) 600 (c) 6000
  13. 13.Best estimate of 196 + 240? (a) 600 (b) 200 (c) 400
  14. 14.Best estimate of 722 + 703? (a) 1600 (b) 1400 (c) 1200
  15. 15.Best estimate of 79 × 28? (a) 2400 (b) 24000 (c) 240
  16. 16.Best estimate of 37 × 34? (a) 1200 (b) 120 (c) 12000
  17. 17.Best estimate of 12 × 96? (a) 100 (b) 10000 (c) 1000
  18. 18.Best estimate of 63 × 96? (a) 60000 (b) 600 (c) 6000
  19. 19.Best estimate of 86 × 54? (a) 4500 (b) 450 (c) 45000
  20. 20.Best estimate of 42 × 78? (a) 3200 (b) 320 (c) 32000
  21. 21.Best estimate of 159 + 361? (a) 800 (b) 600 (c) 400
  22. 22.Best estimate of 64 × 28? (a) 1800 (b) 18000 (c) 180
  23. 23.Best estimate of 625 + 531? (a) 1100 (b) 1300 (c) 900
  24. 24.Best estimate of 48 × 73? (a) 3500 (b) 350 (c) 35000
  25. 25.Best estimate of 44 × 14? (a) 40 (b) 400 (c) 4000
  26. 26.Best estimate of 13 × 89? (a) 900 (b) 90 (c) 9000
  27. 27.Best estimate of 27 × 37? (a) 12000 (b) 1200 (c) 120
  28. 28.Best estimate of 82 × 73? (a) 5600 (b) 560 (c) 56000
  29. 29.Best estimate of 847 + 654? (a) 1500 (b) 1300 (c) 1700
  30. 30.Best estimate of 361 + 555? (a) 800 (b) 1000 (c) 1200
  31. 31.Best estimate of 36 × 36? (a) 1600 (b) 160 (c) 16000
  32. 32.Best estimate of 605 + 253? (a) 700 (b) 900 (c) 1100
  33. 33.Best estimate of 306 + 790? (a) 1100 (b) 1300 (c) 900
  34. 34.Best estimate of 699 + 394? (a) 1300 (b) 900 (c) 1100
  35. 35.Best estimate of 845 + 194? (a) 1200 (b) 1000 (c) 800
  36. 36.Best estimate of 519 + 612? (a) 1300 (b) 1100 (c) 900
  37. 37.Best estimate of 565 + 289? (a) 900 (b) 1100 (c) 700
  38. 38.Best estimate of 44 × 53? (a) 20000 (b) 2000 (c) 200
  39. 39.Best estimate of 37 × 47? (a) 20000 (b) 200 (c) 2000
  40. 40.Best estimate of 18 × 26? (a) 60 (b) 6000 (c) 600

Answer key

  1. 700
  2. 800
  3. 800
  4. 1000
  5. 800
  6. 2500
  7. 5600
  8. 1000
  9. 900
  10. 3500
  11. 700
  12. 600
  13. 400
  14. 1400
  15. 2400
  16. 1200
  17. 1000
  18. 6000
  19. 4500
  20. 3200
  21. 600
  22. 1800
  23. 1100
  24. 3500
  25. 400
  26. 900
  27. 1200
  28. 5600
  29. 1500
  30. 1000
  31. 1600
  32. 900
  33. 1100
  34. 1100
  35. 1000
  36. 1100
  37. 900
  38. 2000
  39. 2000
  40. 600

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