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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 232 · 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 58.67 to one decimal place. =
  2. 2.Round 47.48 to one decimal place. =
  3. 3.Round 18.92 to one decimal place. =
  4. 4.Round 52294 to the nearest thousand.
  5. 5.Which is closest to 201 + 599 + 101? (a) 1100 (b) 800 (c) 900 (d) 1000
  6. 6.Which is closest to 2399 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  7. 7.Which is closest to 996 ÷ 19? (a) 50 (b) 500 (c) 100 (d) 25
  8. 8.Which is closest to 704 + 698 + 395? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  9. 9.Which is closest to 596 × 82? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  10. 10.Which is closest to 702 + 495 + 99? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  11. 11.Round 97351 to the nearest hundred.
  12. 12.Which is closest to 3493 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  13. 13.Which is closest to 807 ÷ 41? (a) 10 (b) 40 (c) 200 (d) 20
  14. 14.Which is closest to 304 + 204 + 201? (a) 900 (b) 800 (c) 600 (d) 700
  15. 15.Round 76698 to the nearest thousand.
  16. 16.Round 82163 to the nearest ten.
  17. 17.Round 95.61 to one decimal place. =
  18. 18.Which is closest to 401 + 200 + 297? (a) 1100 (b) 900 (c) 1000 (d) 800
  19. 19.Which is closest to 704 + 902 + 199? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  20. 20.Which is closest to 503 + 195 + 499? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  21. 21.Round 86.13 to one decimal place. =
  22. 22.Round 8691 to the nearest thousand.
  23. 23.Round 12.42 to one decimal place. =
  24. 24.Which is closest to 903 × 79? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  25. 25.Round 38284 to the nearest thousand.
  26. 26.Round 28929 to the nearest ten.
  27. 27.Which is closest to 907 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  28. 28.Which is closest to 399 + 403 + 604? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  29. 29.Round 42997 to the nearest ten.
  30. 30.Which is closest to 896 × 31? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  31. 31.Which is closest to 803 × 58? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  32. 32.Which is closest to 902 × 78? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  33. 33.Round 12.57 to one decimal place. =
  34. 34.Round 19649 to the nearest thousand.
  35. 35.Which is closest to 1596 ÷ 41? (a) 400 (b) 80 (c) 40 (d) 20
  36. 36.Which is closest to 803 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  37. 37.Round 71.94 to one decimal place. =
  38. 38.Round 89.09 to one decimal place. =
  39. 39.Which is closest to 396 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  40. 40.Which is closest to 399 × 59? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400

Answer key

  1. 58.7
  2. 47.5
  3. 18.9
  4. 52000
  5. 900
  6. 60
  7. 50
  8. 1800
  9. 48000
  10. 1300
  11. 97400
  12. 70
  13. 20
  14. 700
  15. 77000
  16. 82160
  17. 95.6
  18. 900
  19. 1800
  20. 1200
  21. 86.1
  22. 9000
  23. 12.4
  24. 72000
  25. 38000
  26. 28930
  27. 30
  28. 1400
  29. 43000
  30. 27000
  31. 48000
  32. 72000
  33. 12.6
  34. 20000
  35. 40
  36. 20
  37. 71.9
  38. 89.1
  39. 12000
  40. 24000

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