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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 596 · 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 710 + 389? (a) 1100 (b) 900 (c) 1300
  2. 2.Best estimate of 48 × 67? (a) 3500 (b) 350 (c) 35000
  3. 3.Best estimate of 529 + 192? (a) 900 (b) 700 (c) 500
  4. 4.Best estimate of 443 + 522? (a) 1100 (b) 900 (c) 700
  5. 5.Best estimate of 880 + 215? (a) 1100 (b) 1300 (c) 900
  6. 6.Best estimate of 697 + 854? (a) 1400 (b) 1600 (c) 1800
  7. 7.Best estimate of 51 × 98? (a) 50000 (b) 500 (c) 5000
  8. 8.Best estimate of 482 + 343? (a) 1000 (b) 800 (c) 600
  9. 9.Best estimate of 94 × 16? (a) 1800 (b) 18000 (c) 180
  10. 10.Best estimate of 126 + 576? (a) 700 (b) 900 (c) 500
  11. 11.Best estimate of 701 + 435? (a) 1100 (b) 1300 (c) 900
  12. 12.Best estimate of 51 × 69? (a) 35000 (b) 3500 (c) 350
  13. 13.Best estimate of 740 + 655? (a) 1600 (b) 1200 (c) 1400
  14. 14.Best estimate of 18 × 59? (a) 120 (b) 1200 (c) 12000
  15. 15.Best estimate of 174 + 475? (a) 700 (b) 500 (c) 900
  16. 16.Best estimate of 38 × 36? (a) 16000 (b) 160 (c) 1600
  17. 17.Best estimate of 26 × 61? (a) 180 (b) 18000 (c) 1800
  18. 18.Best estimate of 631 + 395? (a) 1000 (b) 1200 (c) 800
  19. 19.Best estimate of 223 + 146? (a) 300 (b) 100 (c) 500
  20. 20.Best estimate of 359 + 432? (a) 600 (b) 1000 (c) 800
  21. 21.Best estimate of 584 + 593? (a) 1400 (b) 1000 (c) 1200
  22. 22.Best estimate of 827 + 370? (a) 1200 (b) 1000 (c) 1400
  23. 23.Best estimate of 480 + 626? (a) 900 (b) 1100 (c) 1300
  24. 24.Best estimate of 43 × 27? (a) 120 (b) 1200 (c) 12000
  25. 25.Best estimate of 79 × 97? (a) 800 (b) 80000 (c) 8000
  26. 26.Best estimate of 17 × 40? (a) 8000 (b) 800 (c) 80
  27. 27.Best estimate of 89 × 26? (a) 2700 (b) 27000 (c) 270
  28. 28.Best estimate of 464 + 319? (a) 1000 (b) 800 (c) 600
  29. 29.Best estimate of 96 × 97? (a) 1000 (b) 10000 (c) 100000
  30. 30.Best estimate of 775 + 408? (a) 1000 (b) 1200 (c) 1400
  31. 31.Best estimate of 463 + 359? (a) 700 (b) 900 (c) 1100
  32. 32.Best estimate of 50 × 72? (a) 35000 (b) 3500 (c) 350
  33. 33.Best estimate of 46 × 34? (a) 1500 (b) 15000 (c) 150
  34. 34.Best estimate of 430 + 480? (a) 700 (b) 900 (c) 1100
  35. 35.Best estimate of 751 + 510? (a) 1100 (b) 1500 (c) 1300
  36. 36.Best estimate of 879 + 351? (a) 1100 (b) 1300 (c) 1500
  37. 37.Best estimate of 203 + 706? (a) 1100 (b) 900 (c) 700
  38. 38.Best estimate of 870 + 558? (a) 1300 (b) 1500 (c) 1700
  39. 39.Best estimate of 83 × 49? (a) 400 (b) 40000 (c) 4000
  40. 40.Best estimate of 307 + 581? (a) 900 (b) 1100 (c) 700

Answer key

  1. 1100
  2. 3500
  3. 700
  4. 900
  5. 1100
  6. 1600
  7. 5000
  8. 800
  9. 1800
  10. 700
  11. 1100
  12. 3500
  13. 1400
  14. 1200
  15. 700
  16. 1600
  17. 1800
  18. 1000
  19. 300
  20. 800
  21. 1200
  22. 1200
  23. 1100
  24. 1200
  25. 8000
  26. 800
  27. 2700
  28. 800
  29. 10000
  30. 1200
  31. 900
  32. 3500
  33. 1500
  34. 900
  35. 1300
  36. 1300
  37. 900
  38. 1500
  39. 4000
  40. 900

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