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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 37 · 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 87.67 to one decimal place. =
  2. 2.Which is closest to 1197 ÷ 31? (a) 80 (b) 400 (c) 20 (d) 40
  3. 3.Round 83047 to the nearest thousand.
  4. 4.Round 17.08 to one decimal place. =
  5. 5.Which is closest to 204 × 90? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  6. 6.Round 55.71 to one decimal place. =
  7. 7.Round 53.33 to one decimal place. =
  8. 8.Which is closest to 195 + 204 + 597? (a) 1000 (b) 1100 (c) 900 (d) 1200
  9. 9.Which is closest to 591 ÷ 29? (a) 200 (b) 10 (c) 40 (d) 20
  10. 10.Round 34.61 to one decimal place. =
  11. 11.Round 41078 to the nearest hundred.
  12. 12.Round 31.16 to one decimal place. =
  13. 13.Which is closest to 905 ÷ 31? (a) 15 (b) 30 (c) 60 (d) 300
  14. 14.Round 26.78 to one decimal place. =
  15. 15.Which is closest to 603 × 82? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  16. 16.Which is closest to 202 × 41? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  17. 17.Which is closest to 695 + 903 + 302? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  18. 18.Which is closest to 503 + 499 + 102? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  19. 19.Which is closest to 799 × 39? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  20. 20.Round 90264 to the nearest thousand.
  21. 21.Which is closest to 2401 ÷ 29? (a) 80 (b) 800 (c) 160 (d) 40
  22. 22.Which is closest to 596 × 30? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  23. 23.Round 21204 to the nearest ten.
  24. 24.Which is closest to 408 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  25. 25.Which is closest to 296 × 79? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  26. 26.Which is closest to 1998 ÷ 41? (a) 25 (b) 100 (c) 50 (d) 500
  27. 27.Round 18.12 to one decimal place. =
  28. 28.Round 10.14 to one decimal place. =
  29. 29.Round 70.24 to one decimal place. =
  30. 30.Round 28.67 to one decimal place. =
  31. 31.Round 23.74 to one decimal place. =
  32. 32.Which is closest to 606 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  33. 33.Which is closest to 396 × 82? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
  34. 34.Which is closest to 100 + 100 + 501? (a) 800 (b) 700 (c) 900 (d) 600
  35. 35.Which is closest to 897 + 695 + 798? (a) 2300 (b) 2600 (c) 2400 (d) 2500
  36. 36.Which is closest to 2501 ÷ 51? (a) 25 (b) 100 (c) 50 (d) 500
  37. 37.Which is closest to 401 × 70? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  38. 38.Round 96047 to the nearest thousand.
  39. 39.Round 47.39 to one decimal place. =
  40. 40.Which is closest to 802 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000

Answer key

  1. 87.7
  2. 40
  3. 83000
  4. 17.1
  5. 18000
  6. 55.7
  7. 53.3
  8. 1000
  9. 20
  10. 34.6
  11. 41100
  12. 31.2
  13. 30
  14. 26.8
  15. 48000
  16. 8000
  17. 1900
  18. 1100
  19. 32000
  20. 90000
  21. 80
  22. 18000
  23. 21200
  24. 20
  25. 24000
  26. 50
  27. 18.1
  28. 10.1
  29. 70.2
  30. 28.7
  31. 23.7
  32. 20
  33. 32000
  34. 700
  35. 2400
  36. 50
  37. 28000
  38. 96000
  39. 47.4
  40. 32000

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