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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 481 · 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 503 × 71? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  2. 2.Round 24331 to the nearest thousand.
  3. 3.Round 2783 to the nearest thousand.
  4. 4.Round 27.16 to one decimal place. =
  5. 5.Which is closest to 901 × 62? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  6. 6.Which is closest to 401 × 18? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  7. 7.Round 33.22 to one decimal place. =
  8. 8.Round 73340 to the nearest thousand.
  9. 9.Which is closest to 1807 ÷ 21? (a) 900 (b) 45 (c) 180 (d) 90
  10. 10.Round 96759 to the nearest hundred.
  11. 11.Round 98.89 to one decimal place. =
  12. 12.Which is closest to 597 + 204 + 503? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  13. 13.Round 81100 to the nearest thousand.
  14. 14.Which is closest to 400 × 39? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  15. 15.Round 30324 to the nearest hundred.
  16. 16.Which is closest to 594 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  17. 17.Which is closest to 396 × 48? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  18. 18.Round 56026 to the nearest hundred.
  19. 19.Round 90119 to the nearest thousand.
  20. 20.Which is closest to 205 + 302 + 801? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  21. 21.Round 76.91 to one decimal place. =
  22. 22.Which is closest to 196 × 71? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  23. 23.Round 74.69 to one decimal place. =
  24. 24.Which is closest to 2793 ÷ 39? (a) 140 (b) 700 (c) 35 (d) 70
  25. 25.Round 63375 to the nearest thousand.
  26. 26.Which is closest to 1500 ÷ 49? (a) 300 (b) 30 (c) 60 (d) 15
  27. 27.Which is closest to 602 × 90? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  28. 28.Which is closest to 2098 ÷ 29? (a) 140 (b) 35 (c) 70 (d) 700
  29. 29.Round 24.08 to one decimal place. =
  30. 30.Which is closest to 2392 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  31. 31.Which is closest to 302 + 796 + 901? (a) 1900 (b) 2200 (c) 2000 (d) 2100
  32. 32.Round 89872 to the nearest ten.
  33. 33.Which is closest to 699 + 305 + 595? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  34. 34.Round 76208 to the nearest ten.
  35. 35.Which is closest to 700 + 100 + 205? (a) 1000 (b) 1100 (c) 900 (d) 1200
  36. 36.Round 11537 to the nearest ten.
  37. 37.Round 76048 to the nearest thousand.
  38. 38.Which is closest to 4497 ÷ 49? (a) 180 (b) 900 (c) 45 (d) 90
  39. 39.Round 16.52 to one decimal place. =
  40. 40.Round 53.31 to one decimal place. =

Answer key

  1. 35000
  2. 24000
  3. 3000
  4. 27.2
  5. 54000
  6. 8000
  7. 33.2
  8. 73000
  9. 90
  10. 96800
  11. 98.9
  12. 1300
  13. 81000
  14. 16000
  15. 30300
  16. 20
  17. 20000
  18. 56000
  19. 90000
  20. 1300
  21. 76.9
  22. 14000
  23. 74.7
  24. 70
  25. 63000
  26. 30
  27. 54000
  28. 70
  29. 24.1
  30. 80
  31. 2000
  32. 89870
  33. 1600
  34. 76210
  35. 1000
  36. 11540
  37. 76000
  38. 90
  39. 16.5
  40. 53.3

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