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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 111 · 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 3505 ÷ 51? (a) 140 (b) 35 (c) 700 (d) 70
  2. 2.Which is closest to 594 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  3. 3.Which is closest to 697 × 49? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  4. 4.Round 96531 to the nearest ten.
  5. 5.Which is closest to 701 × 72? (Round each number first.) (a) 4900 (b) 490000 (c) 49000 (d) 98000
  6. 6.Which is closest to 1002 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  7. 7.Round 20.47 to one decimal place. =
  8. 8.Round 97140 to the nearest thousand.
  9. 9.Which is closest to 302 × 69? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  10. 10.Which is closest to 704 × 28? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  11. 11.Which is closest to 897 + 99 + 200? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  12. 12.Which is closest to 495 + 901 + 797? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  13. 13.Which is closest to 602 ÷ 31? (a) 40 (b) 200 (c) 10 (d) 20
  14. 14.Round 1883 to the nearest hundred.
  15. 15.Which is closest to 396 × 89? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  16. 16.Which is closest to 1792 ÷ 29? (a) 60 (b) 120 (c) 600 (d) 30
  17. 17.Round 95075 to the nearest hundred.
  18. 18.Round 37.07 to one decimal place. =
  19. 19.Round 54.07 to one decimal place. =
  20. 20.Which is closest to 904 × 28? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  21. 21.Which is closest to 500 + 595 + 304? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  22. 22.Which is closest to 2500 ÷ 49? (a) 25 (b) 500 (c) 50 (d) 100
  23. 23.Round 82074 to the nearest hundred.
  24. 24.Which is closest to 800 + 202 + 405? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  25. 25.Which is closest to 595 + 396 + 898? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  26. 26.Round 10685 to the nearest thousand.
  27. 27.Round 83700 to the nearest thousand.
  28. 28.Which is closest to 701 × 69? (Round each number first.) (a) 4900 (b) 49000 (c) 490000 (d) 98000
  29. 29.Round 70010 to the nearest hundred.
  30. 30.Round 15724 to the nearest ten.
  31. 31.Which is closest to 2492 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  32. 32.Round 71.91 to one decimal place. =
  33. 33.Round 21.46 to one decimal place. =
  34. 34.Which is closest to 596 + 695 + 599? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  35. 35.Round 80337 to the nearest ten.
  36. 36.Which is closest to 500 + 705 + 98? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  37. 37.Round 94.83 to one decimal place. =
  38. 38.Round 91.92 to one decimal place. =
  39. 39.Round 82.06 to one decimal place. =
  40. 40.Which is closest to 1396 ÷ 19? (a) 35 (b) 140 (c) 700 (d) 70

Answer key

  1. 70
  2. 20
  3. 35000
  4. 96530
  5. 49000
  6. 20
  7. 20.5
  8. 97000
  9. 21000
  10. 21000
  11. 1200
  12. 2200
  13. 20
  14. 1900
  15. 36000
  16. 60
  17. 95100
  18. 37.1
  19. 54.1
  20. 27000
  21. 1400
  22. 50
  23. 82100
  24. 1400
  25. 1900
  26. 11000
  27. 84000
  28. 49000
  29. 70000
  30. 15720
  31. 50
  32. 71.9
  33. 21.5
  34. 1900
  35. 80340
  36. 1300
  37. 94.8
  38. 91.9
  39. 82.1
  40. 70

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