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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 908 · 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 2993 to the nearest thousand.
  2. 2.Which is closest to 2006 ÷ 49? (a) 400 (b) 40 (c) 80 (d) 20
  3. 3.Which is closest to 1497 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  4. 4.Which is closest to 1603 ÷ 21? (a) 80 (b) 160 (c) 40 (d) 800
  5. 5.Round 65.53 to one decimal place. =
  6. 6.Round 46048 to the nearest ten.
  7. 7.Which is closest to 602 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  8. 8.Round 44895 to the nearest hundred.
  9. 9.Which is closest to 598 + 100 + 403? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  10. 10.Which is closest to 196 × 49? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  11. 11.Which is closest to 393 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  12. 12.Which is closest to 205 + 304 + 303? (a) 700 (b) 900 (c) 1000 (d) 800
  13. 13.Round 93715 to the nearest thousand.
  14. 14.Which is closest to 1505 ÷ 51? (a) 60 (b) 30 (c) 300 (d) 15
  15. 15.Round 83.06 to one decimal place. =
  16. 16.Round 24.37 to one decimal place. =
  17. 17.Round 90732 to the nearest ten.
  18. 18.Round 55.19 to one decimal place. =
  19. 19.Round 38656 to the nearest ten.
  20. 20.Round 86.53 to one decimal place. =
  21. 21.Round 23453 to the nearest ten.
  22. 22.Round 94.61 to one decimal place. =
  23. 23.Which is closest to 804 × 19? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  24. 24.Round 28041 to the nearest thousand.
  25. 25.Which is closest to 800 × 58? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  26. 26.Round 90.37 to one decimal place. =
  27. 27.Which is closest to 4508 ÷ 49? (a) 90 (b) 900 (c) 45 (d) 180
  28. 28.Round 63628 to the nearest hundred.
  29. 29.Round 35.83 to one decimal place. =
  30. 30.Which is closest to 796 × 28? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  31. 31.Which is closest to 697 + 295 + 300? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  32. 32.Which is closest to 398 × 20? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  33. 33.Round 95.66 to one decimal place. =
  34. 34.Round 43.13 to one decimal place. =
  35. 35.Which is closest to 301 × 39? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  36. 36.Round 81061 to the nearest thousand.
  37. 37.Which is closest to 299 × 41? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  38. 38.Which is closest to 603 × 41? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  39. 39.Round 98.54 to one decimal place. =
  40. 40.Which is closest to 597 × 31? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000

Answer key

  1. 3000
  2. 40
  3. 30
  4. 80
  5. 65.5
  6. 46050
  7. 30
  8. 44900
  9. 1100
  10. 10000
  11. 20
  12. 800
  13. 94000
  14. 30
  15. 83.1
  16. 24.4
  17. 90730
  18. 55.2
  19. 38660
  20. 86.5
  21. 23450
  22. 94.6
  23. 16000
  24. 28000
  25. 48000
  26. 90.4
  27. 90
  28. 63600
  29. 35.8
  30. 24000
  31. 1300
  32. 8000
  33. 95.7
  34. 43.1
  35. 12000
  36. 81000
  37. 12000
  38. 24000
  39. 98.5
  40. 18000

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