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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 141 · 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 1804 ÷ 29? (a) 60 (b) 30 (c) 600 (d) 120
  2. 2.Round 96.18 to one decimal place. =
  3. 3.Which is closest to 902 × 40? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  4. 4.Round 5757 to the nearest ten.
  5. 5.Which is closest to 904 × 58? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  6. 6.Round 62.58 to one decimal place. =
  7. 7.Which is closest to 704 × 18? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  8. 8.Round 23.76 to one decimal place. =
  9. 9.Which is closest to 4509 ÷ 51? (a) 900 (b) 45 (c) 180 (d) 90
  10. 10.Which is closest to 695 + 904 + 297? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  11. 11.Which is closest to 1202 ÷ 29? (a) 20 (b) 400 (c) 40 (d) 80
  12. 12.Which is closest to 298 × 88? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  13. 13.Round 1975 to the nearest thousand.
  14. 14.Round 52.12 to one decimal place. =
  15. 15.Which is closest to 199 + 95 + 95? (a) 500 (b) 600 (c) 400 (d) 300
  16. 16.Which is closest to 303 × 88? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  17. 17.Which is closest to 96 + 495 + 297? (a) 1100 (b) 800 (c) 1000 (d) 900
  18. 18.Which is closest to 404 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  19. 19.Round 86.88 to one decimal place. =
  20. 20.Which is closest to 1198 ÷ 19? (a) 60 (b) 30 (c) 120 (d) 600
  21. 21.Which is closest to 798 + 399 + 700? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  22. 22.Round 63196 to the nearest thousand.
  23. 23.Round 31856 to the nearest ten.
  24. 24.Which is closest to 1000 ÷ 19? (a) 25 (b) 50 (c) 100 (d) 500
  25. 25.Round 22.48 to one decimal place. =
  26. 26.Round 32561 to the nearest ten.
  27. 27.Which is closest to 796 + 697 + 403? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  28. 28.Round 12.63 to one decimal place. =
  29. 29.Which is closest to 303 × 70? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
  30. 30.Round 45.69 to one decimal place. =
  31. 31.Which is closest to 897 × 51? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  32. 32.Round 43524 to the nearest hundred.
  33. 33.Which is closest to 397 × 32? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  34. 34.Round 71782 to the nearest thousand.
  35. 35.Round 29.22 to one decimal place. =
  36. 36.Round 41.62 to one decimal place. =
  37. 37.Round 73.68 to one decimal place. =
  38. 38.Round 15539 to the nearest ten.
  39. 39.Round 46.41 to one decimal place. =
  40. 40.Which is closest to 396 + 97 + 198? (a) 900 (b) 800 (c) 700 (d) 600

Answer key

  1. 60
  2. 96.2
  3. 36000
  4. 5760
  5. 54000
  6. 62.6
  7. 14000
  8. 23.8
  9. 90
  10. 1900
  11. 40
  12. 27000
  13. 2000
  14. 52.1
  15. 400
  16. 27000
  17. 900
  18. 20
  19. 86.9
  20. 60
  21. 1900
  22. 63000
  23. 31860
  24. 50
  25. 22.5
  26. 32560
  27. 1900
  28. 12.6
  29. 21000
  30. 45.7
  31. 45000
  32. 43500
  33. 12000
  34. 72000
  35. 29.2
  36. 41.6
  37. 73.7
  38. 15540
  39. 46.4
  40. 700

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