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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 924 · 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 43900 to the nearest thousand.
  2. 2.Which is closest to 599 + 200 + 197? (a) 1100 (b) 1200 (c) 1000 (d) 900
  3. 3.Which is closest to 698 × 22? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  4. 4.Which is closest to 295 + 204 + 300? (a) 900 (b) 800 (c) 1000 (d) 700
  5. 5.Which is closest to 396 × 92? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  6. 6.Which is closest to 203 × 82? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  7. 7.Which is closest to 1999 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  8. 8.Which is closest to 2491 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
  9. 9.Round 73.86 to one decimal place. =
  10. 10.Which is closest to 1608 ÷ 39? (a) 20 (b) 400 (c) 80 (d) 40
  11. 11.Which is closest to 302 × 52? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  12. 12.Which is closest to 1609 ÷ 21? (a) 80 (b) 800 (c) 40 (d) 160
  13. 13.Which is closest to 998 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  14. 14.Round 45361 to the nearest ten.
  15. 15.Round 95.81 to one decimal place. =
  16. 16.Round 29.43 to one decimal place. =
  17. 17.Which is closest to 601 × 18? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  18. 18.Which is closest to 1994 ÷ 49? (a) 80 (b) 20 (c) 400 (d) 40
  19. 19.Which is closest to 1501 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  20. 20.Which is closest to 795 + 297 + 599? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  21. 21.Round 71.13 to one decimal place. =
  22. 22.Round 27.21 to one decimal place. =
  23. 23.Round 5283 to the nearest ten.
  24. 24.Which is closest to 198 × 21? (Round each number first.) (a) 40000 (b) 4000 (c) 8000 (d) 400
  25. 25.Which is closest to 2809 ÷ 41? (a) 700 (b) 140 (c) 70 (d) 35
  26. 26.Which is closest to 603 × 39? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  27. 27.Round 44614 to the nearest hundred.
  28. 28.Which is closest to 503 × 68? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  29. 29.Round 50074 to the nearest ten.
  30. 30.Round 11.21 to one decimal place. =
  31. 31.Round 46759 to the nearest ten.
  32. 32.Which is closest to 400 + 504 + 97? (a) 1100 (b) 1200 (c) 900 (d) 1000
  33. 33.Which is closest to 498 + 105 + 395? (a) 1000 (b) 1100 (c) 900 (d) 1200
  34. 34.Round 77.08 to one decimal place. =
  35. 35.Round 14.59 to one decimal place. =
  36. 36.Round 87.09 to one decimal place. =
  37. 37.Which is closest to 197 × 59? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  38. 38.Round 57.49 to one decimal place. =
  39. 39.Round 75.22 to one decimal place. =
  40. 40.Which is closest to 403 × 78? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000

Answer key

  1. 44000
  2. 1000
  3. 14000
  4. 800
  5. 36000
  6. 16000
  7. 50
  8. 50
  9. 73.9
  10. 40
  11. 15000
  12. 80
  13. 20
  14. 45360
  15. 95.8
  16. 29.4
  17. 12000
  18. 40
  19. 30
  20. 1700
  21. 71.1
  22. 27.2
  23. 5280
  24. 4000
  25. 70
  26. 24000
  27. 44600
  28. 35000
  29. 50070
  30. 11.2
  31. 46760
  32. 1000
  33. 1000
  34. 77.1
  35. 14.6
  36. 87.1
  37. 12000
  38. 57.5
  39. 75.2
  40. 32000

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