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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 326 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 403 × 70? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  2. 2.Round 24.21 to one decimal place. =
  3. 3.Round 59245 to the nearest hundred.
  4. 4.Which is closest to 797 + 297 + 596? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  5. 5.Round 28.78 to one decimal place. =
  6. 6.Which is closest to 2801 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  7. 7.Which is closest to 897 × 20? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  8. 8.Which is closest to 199 + 505 + 398? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  9. 9.Which is closest to 102 + 103 + 205? (a) 600 (b) 300 (c) 500 (d) 400
  10. 10.Which is closest to 297 × 70? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  11. 11.Which is closest to 801 × 22? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  12. 12.Round 24741 to the nearest hundred.
  13. 13.Round 59.78 to one decimal place. =
  14. 14.Round 84.08 to one decimal place. =
  15. 15.Round 48356 to the nearest hundred.
  16. 16.Which is closest to 503 + 295 + 396? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  17. 17.Which is closest to 1195 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  18. 18.Which is closest to 591 ÷ 29? (a) 20 (b) 40 (c) 200 (d) 10
  19. 19.Which is closest to 994 ÷ 49? (a) 10 (b) 40 (c) 200 (d) 20
  20. 20.Which is closest to 900 × 88? (Round each number first.) (a) 810000 (b) 81000 (c) 8100 (d) 162000
  21. 21.Which is closest to 702 + 95 + 99? (a) 1100 (b) 800 (c) 900 (d) 1000
  22. 22.Which is closest to 3598 ÷ 41? (a) 180 (b) 900 (c) 45 (d) 90
  23. 23.Round 29114 to the nearest ten.
  24. 24.Which is closest to 797 + 905 + 801? (a) 2700 (b) 2600 (c) 2500 (d) 2400
  25. 25.Which is closest to 604 × 40? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  26. 26.Round 44.11 to one decimal place. =
  27. 27.Which is closest to 895 ÷ 31? (a) 60 (b) 15 (c) 30 (d) 300
  28. 28.Round 92.89 to one decimal place. =
  29. 29.Round 75953 to the nearest thousand.
  30. 30.Which is closest to 402 × 61? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  31. 31.Round 91441 to the nearest thousand.
  32. 32.Which is closest to 502 × 29? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  33. 33.Round 40.26 to one decimal place. =
  34. 34.Round 96.82 to one decimal place. =
  35. 35.Which is closest to 1806 ÷ 29? (a) 600 (b) 30 (c) 60 (d) 120
  36. 36.Which is closest to 197 + 497 + 299? (a) 1100 (b) 1000 (c) 900 (d) 1200
  37. 37.Which is closest to 791 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  38. 38.Which is closest to 998 ÷ 19? (a) 50 (b) 500 (c) 100 (d) 25
  39. 39.Round 94.18 to one decimal place. =
  40. 40.Which is closest to 3192 ÷ 41? (a) 800 (b) 160 (c) 40 (d) 80

Answer key

  1. 28000
  2. 24.2
  3. 59200
  4. 1700
  5. 28.8
  6. 70
  7. 18000
  8. 1100
  9. 400
  10. 21000
  11. 16000
  12. 24700
  13. 59.8
  14. 84.1
  15. 48400
  16. 1200
  17. 60
  18. 20
  19. 20
  20. 81000
  21. 900
  22. 90
  23. 29110
  24. 2500
  25. 24000
  26. 44.1
  27. 30
  28. 92.9
  29. 76000
  30. 24000
  31. 91000
  32. 15000
  33. 40.3
  34. 96.8
  35. 60
  36. 1000
  37. 20
  38. 50
  39. 94.2
  40. 80

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