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Rounding Off and Estimation Worksheet

Mental maths lesson 15: Rounding off and best estimate · Set 606 · 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 867 + 524? (a) 1600 (b) 1200 (c) 1400
  2. 2.Best estimate of 152 + 395? (a) 800 (b) 400 (c) 600
  3. 3.Best estimate of 76 × 26? (a) 2400 (b) 24000 (c) 240
  4. 4.Best estimate of 40 × 96? (a) 40000 (b) 4000 (c) 400
  5. 5.Best estimate of 90 × 66? (a) 630 (b) 63000 (c) 6300
  6. 6.Best estimate of 16 × 37? (a) 8000 (b) 80 (c) 800
  7. 7.Best estimate of 183 + 694? (a) 900 (b) 700 (c) 1100
  8. 8.Best estimate of 32 × 29? (a) 900 (b) 9000 (c) 90
  9. 9.Best estimate of 823 + 727? (a) 1300 (b) 1700 (c) 1500
  10. 10.Best estimate of 63 × 37? (a) 24000 (b) 240 (c) 2400
  11. 11.Best estimate of 43 × 36? (a) 16000 (b) 1600 (c) 160
  12. 12.Best estimate of 90 × 52? (a) 4500 (b) 450 (c) 45000
  13. 13.Best estimate of 56 × 96? (a) 6000 (b) 60000 (c) 600
  14. 14.Best estimate of 551 + 443? (a) 800 (b) 1200 (c) 1000
  15. 15.Best estimate of 727 + 199? (a) 900 (b) 1100 (c) 700
  16. 16.Best estimate of 809 + 458? (a) 1100 (b) 1300 (c) 1500
  17. 17.Best estimate of 16 × 14? (a) 2000 (b) 20 (c) 200
  18. 18.Best estimate of 723 + 687? (a) 1200 (b) 1400 (c) 1600
  19. 19.Best estimate of 88 × 83? (a) 7200 (b) 720 (c) 72000
  20. 20.Best estimate of 251 + 505? (a) 1000 (b) 800 (c) 600
  21. 21.Best estimate of 57 × 13? (a) 60 (b) 600 (c) 6000
  22. 22.Best estimate of 839 + 390? (a) 1000 (b) 1400 (c) 1200
  23. 23.Best estimate of 254 + 803? (a) 1300 (b) 900 (c) 1100
  24. 24.Best estimate of 94 × 41? (a) 36000 (b) 3600 (c) 360
  25. 25.Best estimate of 293 + 186? (a) 500 (b) 300 (c) 700
  26. 26.Best estimate of 43 × 97? (a) 40000 (b) 400 (c) 4000
  27. 27.Best estimate of 659 + 332? (a) 1200 (b) 800 (c) 1000
  28. 28.Best estimate of 234 + 737? (a) 1100 (b) 700 (c) 900
  29. 29.Best estimate of 230 + 744? (a) 900 (b) 700 (c) 1100
  30. 30.Best estimate of 29 × 93? (a) 270 (b) 27000 (c) 2700
  31. 31.Best estimate of 125 + 217? (a) 300 (b) 500 (c) 100
  32. 32.Best estimate of 205 + 743? (a) 1100 (b) 900 (c) 700
  33. 33.Best estimate of 88 × 66? (a) 6300 (b) 63000 (c) 630
  34. 34.Best estimate of 331 + 868? (a) 1000 (b) 1200 (c) 1400
  35. 35.Best estimate of 218 + 261? (a) 500 (b) 700 (c) 300
  36. 36.Best estimate of 799 + 778? (a) 1600 (b) 1400 (c) 1800
  37. 37.Best estimate of 229 + 267? (a) 500 (b) 700 (c) 300
  38. 38.Best estimate of 33 × 57? (a) 18000 (b) 1800 (c) 180
  39. 39.Best estimate of 17 × 54? (a) 10000 (b) 100 (c) 1000
  40. 40.Best estimate of 341 + 400? (a) 900 (b) 500 (c) 700

Answer key

  1. 1400
  2. 600
  3. 2400
  4. 4000
  5. 6300
  6. 800
  7. 900
  8. 900
  9. 1500
  10. 2400
  11. 1600
  12. 4500
  13. 6000
  14. 1000
  15. 900
  16. 1300
  17. 200
  18. 1400
  19. 7200
  20. 800
  21. 600
  22. 1200
  23. 1100
  24. 3600
  25. 500
  26. 4000
  27. 1000
  28. 900
  29. 900
  30. 2700
  31. 300
  32. 900
  33. 6300
  34. 1200
  35. 500
  36. 1600
  37. 500
  38. 1800
  39. 1000
  40. 700

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