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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 81 · 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 396 + 602 + 398? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  2. 2.Which is closest to 896 × 32? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  3. 3.Which is closest to 399 × 61? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  4. 4.Which is closest to 204 + 97 + 99? (a) 400 (b) 500 (c) 300 (d) 600
  5. 5.Round 64.37 to one decimal place. =
  6. 6.Round 63935 to the nearest thousand.
  7. 7.Round 12.57 to one decimal place. =
  8. 8.Round 4758 to the nearest hundred.
  9. 9.Round 99.41 to one decimal place. =
  10. 10.Which is closest to 609 ÷ 19? (a) 15 (b) 300 (c) 30 (d) 60
  11. 11.Round 45.41 to one decimal place. =
  12. 12.Round 83.61 to one decimal place. =
  13. 13.Round 62.92 to one decimal place. =
  14. 14.Which is closest to 2405 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  15. 15.Which is closest to 904 × 22? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  16. 16.Which is closest to 593 ÷ 29? (a) 200 (b) 20 (c) 40 (d) 10
  17. 17.Which is closest to 606 ÷ 21? (a) 30 (b) 60 (c) 15 (d) 300
  18. 18.Round 15056 to the nearest thousand.
  19. 19.Round 57.62 to one decimal place. =
  20. 20.Which is closest to 205 + 202 + 804? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  21. 21.Which is closest to 596 + 298 + 901? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  22. 22.Round 42.84 to one decimal place. =
  23. 23.Which is closest to 899 × 52? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  24. 24.Round 97.57 to one decimal place. =
  25. 25.Round 59.94 to one decimal place. =
  26. 26.Round 13163 to the nearest hundred.
  27. 27.Which is closest to 1192 ÷ 41? (a) 30 (b) 300 (c) 60 (d) 15
  28. 28.Which is closest to 296 × 61? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  29. 29.Round 48.79 to one decimal place. =
  30. 30.Which is closest to 2508 ÷ 51? (a) 500 (b) 100 (c) 50 (d) 25
  31. 31.Round 84.17 to one decimal place. =
  32. 32.Which is closest to 196 × 21? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
  33. 33.Which is closest to 1195 ÷ 41? (a) 15 (b) 30 (c) 60 (d) 300
  34. 34.Round 28.79 to one decimal place. =
  35. 35.Round 24.81 to one decimal place. =
  36. 36.Round 5062 to the nearest hundred.
  37. 37.Round 79296 to the nearest hundred.
  38. 38.Round 62.46 to one decimal place. =
  39. 39.Round 39.72 to one decimal place. =
  40. 40.Round 30.94 to one decimal place. =

Answer key

  1. 1400
  2. 27000
  3. 24000
  4. 400
  5. 64.4
  6. 64000
  7. 12.6
  8. 4800
  9. 99.4
  10. 30
  11. 45.4
  12. 83.6
  13. 62.9
  14. 60
  15. 18000
  16. 20
  17. 30
  18. 15000
  19. 57.6
  20. 1200
  21. 1800
  22. 42.8
  23. 45000
  24. 97.6
  25. 59.9
  26. 13200
  27. 30
  28. 18000
  29. 48.8
  30. 50
  31. 84.2
  32. 4000
  33. 30
  34. 28.8
  35. 24.8
  36. 5100
  37. 79300
  38. 62.5
  39. 39.7
  40. 30.9

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