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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 927 · 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 92.52 to one decimal place. =
  2. 2.Round 51243 to the nearest thousand.
  3. 3.Which is closest to 502 × 68? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  4. 4.Round 18.38 to one decimal place. =
  5. 5.Which is closest to 98 + 703 + 100? (a) 800 (b) 1000 (c) 1100 (d) 900
  6. 6.Which is closest to 1791 ÷ 21? (a) 900 (b) 180 (c) 90 (d) 45
  7. 7.Which is closest to 2404 ÷ 41? (a) 30 (b) 120 (c) 60 (d) 600
  8. 8.Round 62.66 to one decimal place. =
  9. 9.Which is closest to 606 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  10. 10.Which is closest to 1802 ÷ 21? (a) 45 (b) 180 (c) 90 (d) 900
  11. 11.Round 51.81 to one decimal place. =
  12. 12.Round 20.18 to one decimal place. =
  13. 13.Round 96.17 to one decimal place. =
  14. 14.Which is closest to 803 + 697 + 402? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  15. 15.Which is closest to 2392 ÷ 31? (a) 80 (b) 160 (c) 40 (d) 800
  16. 16.Round 63.68 to one decimal place. =
  17. 17.Which is closest to 2795 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
  18. 18.Which is closest to 608 ÷ 29? (a) 200 (b) 20 (c) 40 (d) 10
  19. 19.Round 65.67 to one decimal place. =
  20. 20.Round 5744 to the nearest hundred.
  21. 21.Which is closest to 1009 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  22. 22.Which is closest to 300 × 72? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  23. 23.Round 62797 to the nearest thousand.
  24. 24.Round 24.77 to one decimal place. =
  25. 25.Round 10376 to the nearest ten.
  26. 26.Which is closest to 499 × 20? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  27. 27.Which is closest to 797 + 399 + 898? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  28. 28.Round 60990 to the nearest thousand.
  29. 29.Which is closest to 95 + 603 + 302? (a) 1200 (b) 1000 (c) 900 (d) 1100
  30. 30.Which is closest to 803 × 30? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  31. 31.Which is closest to 303 × 32? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  32. 32.Which is closest to 201 + 401 + 297? (a) 800 (b) 1000 (c) 1100 (d) 900
  33. 33.Round 35.07 to one decimal place. =
  34. 34.Round 72904 to the nearest ten.
  35. 35.Which is closest to 804 + 300 + 501? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  36. 36.Which is closest to 401 × 58? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  37. 37.Which is closest to 4506 ÷ 51? (a) 900 (b) 180 (c) 45 (d) 90
  38. 38.Round 95.89 to one decimal place. =
  39. 39.Round 23.67 to one decimal place. =
  40. 40.Round 31.29 to one decimal place. =

Answer key

  1. 92.5
  2. 51000
  3. 35000
  4. 18.4
  5. 900
  6. 90
  7. 60
  8. 62.7
  9. 20
  10. 90
  11. 51.8
  12. 20.2
  13. 96.2
  14. 1900
  15. 80
  16. 63.7
  17. 70
  18. 20
  19. 65.7
  20. 5700
  21. 50
  22. 21000
  23. 63000
  24. 24.8
  25. 10380
  26. 10000
  27. 2100
  28. 61000
  29. 1000
  30. 24000
  31. 9000
  32. 900
  33. 35.1
  34. 72900
  35. 1600
  36. 24000
  37. 90
  38. 95.9
  39. 23.7
  40. 31.3

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