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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 600 · 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 96 + 498 + 796? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  2. 2.Which is closest to 202 + 801 + 904? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  3. 3.Round 9972 to the nearest thousand.
  4. 4.Which is closest to 696 + 902 + 699? (a) 2200 (b) 2400 (c) 2300 (d) 2500
  5. 5.Round 16489 to the nearest ten.
  6. 6.Which is closest to 896 + 302 + 404? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  7. 7.Round 60.46 to one decimal place. =
  8. 8.Which is closest to 299 + 903 + 695? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  9. 9.Which is closest to 1499 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  10. 10.Which is closest to 396 × 51? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  11. 11.Which is closest to 299 × 81? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  12. 12.Which is closest to 296 + 902 + 596? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  13. 13.Which is closest to 1798 ÷ 19? (a) 90 (b) 180 (c) 45 (d) 900
  14. 14.Which is closest to 697 + 903 + 303? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  15. 15.Round 24405 to the nearest thousand.
  16. 16.Round 23.76 to one decimal place. =
  17. 17.Which is closest to 304 × 18? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  18. 18.Round 21.18 to one decimal place. =
  19. 19.Round 82556 to the nearest thousand.
  20. 20.Round 83408 to the nearest hundred.
  21. 21.Round 69859 to the nearest hundred.
  22. 22.Which is closest to 904 ÷ 29? (a) 30 (b) 15 (c) 300 (d) 60
  23. 23.Which is closest to 95 + 98 + 400? (a) 800 (b) 600 (c) 700 (d) 500
  24. 24.Which is closest to 697 × 20? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  25. 25.Round 81151 to the nearest ten.
  26. 26.Round 24.91 to one decimal place. =
  27. 27.Which is closest to 591 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  28. 28.Which is closest to 196 + 302 + 596? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  29. 29.Which is closest to 897 × 58? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  30. 30.Which is closest to 2008 ÷ 49? (a) 80 (b) 400 (c) 40 (d) 20
  31. 31.Round 51564 to the nearest ten.
  32. 32.Which is closest to 596 × 61? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  33. 33.Round 77884 to the nearest ten.
  34. 34.Which is closest to 804 ÷ 19? (a) 80 (b) 400 (c) 40 (d) 20
  35. 35.Which is closest to 296 × 30? (Round each number first.) (a) 90000 (b) 18000 (c) 9000 (d) 900
  36. 36.Which is closest to 802 + 300 + 598? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  37. 37.Round 97952 to the nearest hundred.
  38. 38.Round 5132 to the nearest hundred.
  39. 39.Which is closest to 802 × 71? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  40. 40.Round 70.76 to one decimal place. =

Answer key

  1. 1400
  2. 1900
  3. 10000
  4. 2300
  5. 16490
  6. 1600
  7. 60.5
  8. 1900
  9. 50
  10. 20000
  11. 24000
  12. 1800
  13. 90
  14. 1900
  15. 24000
  16. 23.8
  17. 6000
  18. 21.2
  19. 83000
  20. 83400
  21. 69900
  22. 30
  23. 600
  24. 14000
  25. 81150
  26. 24.9
  27. 20
  28. 1100
  29. 54000
  30. 40
  31. 51560
  32. 36000
  33. 77880
  34. 40
  35. 9000
  36. 1700
  37. 98000
  38. 5100
  39. 56000
  40. 70.8

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