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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 419 · 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 897 + 895 + 296? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  2. 2.Round 22828 to the nearest hundred.
  3. 3.Round 67.37 to one decimal place. =
  4. 4.Round 67.67 to one decimal place. =
  5. 5.Which is closest to 296 + 96 + 298? (a) 700 (b) 900 (c) 800 (d) 600
  6. 6.Round 96.39 to one decimal place. =
  7. 7.Which is closest to 503 × 62? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  8. 8.Which is closest to 401 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  9. 9.Which is closest to 795 + 903 + 303? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  10. 10.Round 6140 to the nearest thousand.
  11. 11.Which is closest to 604 × 20? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  12. 12.Which is closest to 202 + 498 + 396? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  13. 13.Which is closest to 203 × 71? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  14. 14.Which is closest to 603 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  15. 15.Round 42632 to the nearest hundred.
  16. 16.Which is closest to 596 × 58? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  17. 17.Which is closest to 503 + 302 + 902? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  18. 18.Which is closest to 896 × 21? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  19. 19.Which is closest to 1791 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  20. 20.Which is closest to 502 + 704 + 703? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  21. 21.Which is closest to 701 × 88? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  22. 22.Which is closest to 502 + 798 + 403? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  23. 23.Round 29.76 to one decimal place. =
  24. 24.Round 47185 to the nearest hundred.
  25. 25.Round 93528 to the nearest hundred.
  26. 26.Round 75919 to the nearest ten.
  27. 27.Which is closest to 1193 ÷ 41? (a) 15 (b) 60 (c) 30 (d) 300
  28. 28.Round 40.52 to one decimal place. =
  29. 29.Which is closest to 604 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  30. 30.Round 56.31 to one decimal place. =
  31. 31.Which is closest to 699 × 50? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
  32. 32.Which is closest to 396 × 20? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  33. 33.Round 65373 to the nearest ten.
  34. 34.Which is closest to 796 × 61? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
  35. 35.Which is closest to 3195 ÷ 39? (a) 80 (b) 40 (c) 160 (d) 800
  36. 36.Which is closest to 503 + 97 + 804? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  37. 37.Which is closest to 297 × 91? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  38. 38.Round 37.92 to one decimal place. =
  39. 39.Which is closest to 204 + 102 + 804? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  40. 40.Which is closest to 197 + 302 + 596? (a) 1300 (b) 1200 (c) 1000 (d) 1100

Answer key

  1. 2100
  2. 22800
  3. 67.4
  4. 67.7
  5. 700
  6. 96.4
  7. 30000
  8. 12000
  9. 2000
  10. 6000
  11. 12000
  12. 1100
  13. 14000
  14. 20
  15. 42600
  16. 36000
  17. 1700
  18. 18000
  19. 60
  20. 1900
  21. 63000
  22. 1700
  23. 29.8
  24. 47200
  25. 93500
  26. 75920
  27. 30
  28. 40.5
  29. 30
  30. 56.3
  31. 35000
  32. 8000
  33. 65370
  34. 48000
  35. 80
  36. 1400
  37. 27000
  38. 37.9
  39. 1100
  40. 1100

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