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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 492 · 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 398 ÷ 21? (a) 20 (b) 10 (c) 200 (d) 40
  2. 2.Round 87.66 to one decimal place. =
  3. 3.Round 40996 to the nearest hundred.
  4. 4.Which is closest to 896 × 69? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  5. 5.Round 10.82 to one decimal place. =
  6. 6.Round 77764 to the nearest hundred.
  7. 7.Round 85.21 to one decimal place. =
  8. 8.Round 25.38 to one decimal place. =
  9. 9.Which is closest to 95 + 396 + 905? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  10. 10.Round 59.63 to one decimal place. =
  11. 11.Which is closest to 204 × 91? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  12. 12.Round 61.12 to one decimal place. =
  13. 13.Round 62351 to the nearest thousand.
  14. 14.Round 73981 to the nearest thousand.
  15. 15.Which is closest to 1800 ÷ 29? (a) 30 (b) 120 (c) 600 (d) 60
  16. 16.Round 11.64 to one decimal place. =
  17. 17.Round 23343 to the nearest ten.
  18. 18.Which is closest to 2800 ÷ 41? (a) 70 (b) 35 (c) 140 (d) 700
  19. 19.Round 88997 to the nearest ten.
  20. 20.Round 30.48 to one decimal place. =
  21. 21.Which is closest to 2802 ÷ 41? (a) 35 (b) 70 (c) 140 (d) 700
  22. 22.Which is closest to 4003 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  23. 23.Round 83.37 to one decimal place. =
  24. 24.Round 59.66 to one decimal place. =
  25. 25.Round 56.88 to one decimal place. =
  26. 26.Which is closest to 805 + 301 + 399? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  27. 27.Round 99.58 to one decimal place. =
  28. 28.Which is closest to 403 × 89? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  29. 29.Which is closest to 1509 ÷ 49? (a) 300 (b) 60 (c) 15 (d) 30
  30. 30.Which is closest to 499 + 397 + 398? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  31. 31.Round 91.71 to one decimal place. =
  32. 32.Which is closest to 1801 ÷ 31? (a) 30 (b) 60 (c) 120 (d) 600
  33. 33.Round 44.47 to one decimal place. =
  34. 34.Which is closest to 496 × 40? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  35. 35.Which is closest to 202 × 72? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  36. 36.Which is closest to 2807 ÷ 39? (a) 700 (b) 35 (c) 70 (d) 140
  37. 37.Round 63319 to the nearest ten.
  38. 38.Which is closest to 302 + 903 + 597? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  39. 39.Which is closest to 1599 ÷ 41? (a) 80 (b) 20 (c) 400 (d) 40
  40. 40.Round 16.19 to one decimal place. =

Answer key

  1. 20
  2. 87.7
  3. 41000
  4. 63000
  5. 10.8
  6. 77800
  7. 85.2
  8. 25.4
  9. 1400
  10. 59.6
  11. 18000
  12. 61.1
  13. 62000
  14. 74000
  15. 60
  16. 11.6
  17. 23340
  18. 70
  19. 89000
  20. 30.5
  21. 70
  22. 80
  23. 83.4
  24. 59.7
  25. 56.9
  26. 1500
  27. 99.6
  28. 36000
  29. 30
  30. 1300
  31. 91.7
  32. 60
  33. 44.5
  34. 20000
  35. 14000
  36. 70
  37. 63320
  38. 1800
  39. 40
  40. 16.2

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