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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 437 · 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.Round 21.71 to one decimal place. =
  2. 2.Which is closest to 100 + 203 + 795? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  3. 3.Which is closest to 396 × 68? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  4. 4.Which is closest to 399 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  5. 5.Which is closest to 803 × 20? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  6. 6.Round 30.31 to one decimal place. =
  7. 7.Which is closest to 904 + 397 + 896? (a) 2400 (b) 2100 (c) 2200 (d) 2300
  8. 8.Round 49953 to the nearest hundred.
  9. 9.Round 56.32 to one decimal place. =
  10. 10.Which is closest to 495 + 99 + 402? (a) 1100 (b) 1200 (c) 900 (d) 1000
  11. 11.Round 56989 to the nearest thousand.
  12. 12.Round 29247 to the nearest hundred.
  13. 13.Which is closest to 2802 ÷ 39? (a) 140 (b) 35 (c) 700 (d) 70
  14. 14.Which is closest to 101 + 499 + 704? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  15. 15.Round 48.72 to one decimal place. =
  16. 16.Which is closest to 896 + 399 + 495? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  17. 17.Which is closest to 497 + 805 + 702? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  18. 18.Which is closest to 403 ÷ 19? (a) 10 (b) 20 (c) 40 (d) 200
  19. 19.Which is closest to 704 × 90? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  20. 20.Round 35.63 to one decimal place. =
  21. 21.Which is closest to 2507 ÷ 51? (a) 500 (b) 25 (c) 100 (d) 50
  22. 22.Round 18425 to the nearest hundred.
  23. 23.Round 16.58 to one decimal place. =
  24. 24.Round 69329 to the nearest hundred.
  25. 25.Round 91.38 to one decimal place. =
  26. 26.Round 60.22 to one decimal place. =
  27. 27.Which is closest to 396 + 704 + 497? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  28. 28.Which is closest to 197 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  29. 29.Round 14560 to the nearest thousand.
  30. 30.Which is closest to 499 + 202 + 103? (a) 900 (b) 800 (c) 700 (d) 1000
  31. 31.Which is closest to 802 × 28? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  32. 32.Which is closest to 403 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  33. 33.Which is closest to 1595 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  34. 34.Round 39.52 to one decimal place. =
  35. 35.Which is closest to 296 × 18? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  36. 36.Which is closest to 302 × 41? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  37. 37.Round 32.37 to one decimal place. =
  38. 38.Round 35.49 to one decimal place. =
  39. 39.Round 76604 to the nearest ten.
  40. 40.Which is closest to 397 × 49? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000

Answer key

  1. 21.7
  2. 1100
  3. 28000
  4. 16000
  5. 16000
  6. 30.3
  7. 2200
  8. 50000
  9. 56.3
  10. 1000
  11. 57000
  12. 29200
  13. 70
  14. 1300
  15. 48.7
  16. 1800
  17. 2000
  18. 20
  19. 63000
  20. 35.6
  21. 50
  22. 18400
  23. 16.6
  24. 69300
  25. 91.4
  26. 60.2
  27. 1600
  28. 18000
  29. 15000
  30. 800
  31. 24000
  32. 12000
  33. 40
  34. 39.5
  35. 6000
  36. 12000
  37. 32.4
  38. 35.5
  39. 76600
  40. 20000

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