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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 962 · 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 90 × 63? (a) 5400 (b) 540 (c) 54000
  2. 2.Best estimate of 304 + 285? (a) 400 (b) 800 (c) 600
  3. 3.Best estimate of 48 × 20? (a) 1000 (b) 10000 (c) 100
  4. 4.Best estimate of 19 × 56? (a) 12000 (b) 120 (c) 1200
  5. 5.Best estimate of 76 × 41? (a) 320 (b) 3200 (c) 32000
  6. 6.Best estimate of 756 + 620? (a) 1400 (b) 1200 (c) 1600
  7. 7.Best estimate of 793 + 866? (a) 1900 (b) 1700 (c) 1500
  8. 8.Best estimate of 29 × 77? (a) 240 (b) 2400 (c) 24000
  9. 9.Best estimate of 76 × 47? (a) 400 (b) 40000 (c) 4000
  10. 10.Best estimate of 46 × 91? (a) 4500 (b) 45000 (c) 450
  11. 11.Best estimate of 93 × 31? (a) 2700 (b) 270 (c) 27000
  12. 12.Best estimate of 272 + 594? (a) 1100 (b) 700 (c) 900
  13. 13.Best estimate of 27 × 26? (a) 9000 (b) 900 (c) 90
  14. 14.Best estimate of 96 × 56? (a) 60000 (b) 600 (c) 6000
  15. 15.Best estimate of 430 + 606? (a) 1000 (b) 1200 (c) 800
  16. 16.Best estimate of 14 × 44? (a) 4000 (b) 400 (c) 40
  17. 17.Best estimate of 717 + 743? (a) 1400 (b) 1600 (c) 1200
  18. 18.Best estimate of 42 × 26? (a) 12000 (b) 1200 (c) 120
  19. 19.Best estimate of 58 × 84? (a) 4800 (b) 48000 (c) 480
  20. 20.Best estimate of 295 + 296? (a) 600 (b) 800 (c) 400
  21. 21.Best estimate of 42 × 64? (a) 2400 (b) 240 (c) 24000
  22. 22.Best estimate of 92 × 30? (a) 2700 (b) 270 (c) 27000
  23. 23.Best estimate of 433 + 534? (a) 1100 (b) 900 (c) 700
  24. 24.Best estimate of 71 × 33? (a) 2100 (b) 21000 (c) 210
  25. 25.Best estimate of 34 × 92? (a) 27000 (b) 2700 (c) 270
  26. 26.Best estimate of 20 × 29? (a) 6000 (b) 60 (c) 600
  27. 27.Best estimate of 267 + 649? (a) 1100 (b) 700 (c) 900
  28. 28.Best estimate of 513 + 552? (a) 1100 (b) 1300 (c) 900
  29. 29.Best estimate of 849 + 460? (a) 1300 (b) 1500 (c) 1100
  30. 30.Best estimate of 96 × 73? (a) 7000 (b) 70000 (c) 700
  31. 31.Best estimate of 16 × 68? (a) 1400 (b) 140 (c) 14000
  32. 32.Best estimate of 63 × 53? (a) 3000 (b) 30000 (c) 300
  33. 33.Best estimate of 759 + 604? (a) 1200 (b) 1400 (c) 1600
  34. 34.Best estimate of 297 + 846? (a) 1300 (b) 1100 (c) 900
  35. 35.Best estimate of 533 + 159? (a) 500 (b) 700 (c) 900
  36. 36.Best estimate of 58 × 38? (a) 2400 (b) 240 (c) 24000
  37. 37.Best estimate of 849 + 428? (a) 1000 (b) 1400 (c) 1200
  38. 38.Best estimate of 94 × 42? (a) 3600 (b) 36000 (c) 360
  39. 39.Best estimate of 193 + 788? (a) 1000 (b) 1200 (c) 800
  40. 40.Best estimate of 810 + 853? (a) 1500 (b) 1900 (c) 1700

Answer key

  1. 5400
  2. 600
  3. 1000
  4. 1200
  5. 3200
  6. 1400
  7. 1700
  8. 2400
  9. 4000
  10. 4500
  11. 2700
  12. 900
  13. 900
  14. 6000
  15. 1000
  16. 400
  17. 1400
  18. 1200
  19. 4800
  20. 600
  21. 2400
  22. 2700
  23. 900
  24. 2100
  25. 2700
  26. 600
  27. 900
  28. 1100
  29. 1300
  30. 7000
  31. 1400
  32. 3000
  33. 1400
  34. 1100
  35. 700
  36. 2400
  37. 1200
  38. 3600
  39. 1000
  40. 1700

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