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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 36 · 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 74.32 to one decimal place. =
  2. 2.Which is closest to 303 + 698 + 99? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  3. 3.Which is closest to 3491 ÷ 49? (a) 70 (b) 35 (c) 140 (d) 700
  4. 4.Round 49307 to the nearest hundred.
  5. 5.Round 96.87 to one decimal place. =
  6. 6.Which is closest to 300 + 299 + 301? (a) 1000 (b) 1100 (c) 800 (d) 900
  7. 7.Which is closest to 400 × 91? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  8. 8.Which is closest to 803 + 498 + 696? (a) 2200 (b) 2000 (c) 2100 (d) 1900
  9. 9.Which is closest to 699 + 897 + 805? (a) 2300 (b) 2400 (c) 2600 (d) 2500
  10. 10.Round 92759 to the nearest ten.
  11. 11.Round 52374 to the nearest ten.
  12. 12.Round 64015 to the nearest hundred.
  13. 13.Which is closest to 798 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  14. 14.Which is closest to 403 + 896 + 397? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  15. 15.Round 3219 to the nearest thousand.
  16. 16.Which is closest to 2799 ÷ 41? (a) 140 (b) 700 (c) 35 (d) 70
  17. 17.Round 91161 to the nearest ten.
  18. 18.Which is closest to 599 + 695 + 299? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  19. 19.Which is closest to 600 + 498 + 596? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  20. 20.Which is closest to 99 + 596 + 696? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  21. 21.Which is closest to 297 × 79? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  22. 22.Which is closest to 698 + 899 + 101? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  23. 23.Which is closest to 505 + 595 + 598? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  24. 24.Round 29.44 to one decimal place. =
  25. 25.Round 66458 to the nearest hundred.
  26. 26.Round 13.93 to one decimal place. =
  27. 27.Round 35.23 to one decimal place. =
  28. 28.Which is closest to 3504 ÷ 49? (a) 700 (b) 70 (c) 140 (d) 35
  29. 29.Which is closest to 3197 ÷ 39? (a) 40 (b) 160 (c) 800 (d) 80
  30. 30.Which is closest to 396 × 52? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  31. 31.Which is closest to 205 + 795 + 301? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  32. 32.Round 52524 to the nearest ten.
  33. 33.Round 26413 to the nearest ten.
  34. 34.Which is closest to 1591 ÷ 41? (a) 20 (b) 400 (c) 40 (d) 80
  35. 35.Which is closest to 298 + 297 + 902? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  36. 36.Which is closest to 603 + 597 + 902? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  37. 37.Round 93179 to the nearest thousand.
  38. 38.Which is closest to 903 × 39? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  39. 39.Which is closest to 393 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  40. 40.Which is closest to 3203 ÷ 41? (a) 160 (b) 80 (c) 800 (d) 40

Answer key

  1. 74.3
  2. 1100
  3. 70
  4. 49300
  5. 96.9
  6. 900
  7. 36000
  8. 2000
  9. 2400
  10. 92760
  11. 52370
  12. 64000
  13. 24000
  14. 1700
  15. 3000
  16. 70
  17. 91160
  18. 1600
  19. 1700
  20. 1400
  21. 24000
  22. 1700
  23. 1700
  24. 29.4
  25. 66500
  26. 13.9
  27. 35.2
  28. 70
  29. 80
  30. 20000
  31. 1300
  32. 52520
  33. 26410
  34. 40
  35. 1500
  36. 2100
  37. 93000
  38. 36000
  39. 20
  40. 80

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