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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 370 · 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 904 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  2. 2.Round 34.47 to one decimal place. =
  3. 3.Which is closest to 609 ÷ 31? (a) 20 (b) 40 (c) 200 (d) 10
  4. 4.Which is closest to 1393 ÷ 19? (a) 140 (b) 700 (c) 70 (d) 35
  5. 5.Which is closest to 801 + 205 + 903? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  6. 6.Round 74855 to the nearest hundred.
  7. 7.Which is closest to 498 × 80? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  8. 8.Which is closest to 504 × 39? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  9. 9.Round 30.82 to one decimal place. =
  10. 10.Which is closest to 400 × 42? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  11. 11.Which is closest to 1592 ÷ 21? (a) 80 (b) 160 (c) 800 (d) 40
  12. 12.Round 70494 to the nearest ten.
  13. 13.Round 88902 to the nearest thousand.
  14. 14.Which is closest to 899 ÷ 31? (a) 15 (b) 30 (c) 300 (d) 60
  15. 15.Which is closest to 799 + 105 + 698? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  16. 16.Which is closest to 901 × 60? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
  17. 17.Which is closest to 404 + 505 + 103? (a) 1200 (b) 1000 (c) 900 (d) 1100
  18. 18.Which is closest to 104 + 402 + 100? (a) 700 (b) 800 (c) 500 (d) 600
  19. 19.Which is closest to 898 × 38? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  20. 20.Which is closest to 502 + 102 + 396? (a) 1000 (b) 1200 (c) 1100 (d) 900
  21. 21.Round 86.34 to one decimal place. =
  22. 22.Round 67.89 to one decimal place. =
  23. 23.Which is closest to 903 + 801 + 197? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  24. 24.Round 22.61 to one decimal place. =
  25. 25.Round 4766 to the nearest hundred.
  26. 26.Which is closest to 596 ÷ 21? (a) 15 (b) 60 (c) 300 (d) 30
  27. 27.Round 81.54 to one decimal place. =
  28. 28.Round 56.08 to one decimal place. =
  29. 29.Round 49594 to the nearest hundred.
  30. 30.Which is closest to 103 + 705 + 203? (a) 1200 (b) 1000 (c) 900 (d) 1100
  31. 31.Which is closest to 600 ÷ 19? (a) 15 (b) 60 (c) 300 (d) 30
  32. 32.Which is closest to 2000 ÷ 39? (a) 50 (b) 25 (c) 100 (d) 500
  33. 33.Which is closest to 1495 ÷ 51? (a) 300 (b) 15 (c) 30 (d) 60
  34. 34.Which is closest to 401 × 89? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  35. 35.Which is closest to 799 ÷ 21? (a) 400 (b) 80 (c) 40 (d) 20
  36. 36.Which is closest to 403 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  37. 37.Which is closest to 596 + 703 + 797? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  38. 38.Which is closest to 903 ÷ 29? (a) 30 (b) 15 (c) 300 (d) 60
  39. 39.Round 26164 to the nearest hundred.
  40. 40.Which is closest to 597 + 295 + 301? (a) 1400 (b) 1200 (c) 1100 (d) 1300

Answer key

  1. 30
  2. 34.5
  3. 20
  4. 70
  5. 1900
  6. 74900
  7. 40000
  8. 20000
  9. 30.8
  10. 16000
  11. 80
  12. 70490
  13. 89000
  14. 30
  15. 1600
  16. 54000
  17. 1000
  18. 600
  19. 36000
  20. 1000
  21. 86.3
  22. 67.9
  23. 1900
  24. 22.6
  25. 4800
  26. 30
  27. 81.5
  28. 56.1
  29. 49600
  30. 1000
  31. 30
  32. 50
  33. 30
  34. 36000
  35. 40
  36. 28000
  37. 2100
  38. 30
  39. 26200
  40. 1200

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