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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 140 · 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 900 × 29? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  2. 2.Which is closest to 2091 ÷ 29? (a) 140 (b) 700 (c) 70 (d) 35
  3. 3.Which is closest to 1396 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  4. 4.Which is closest to 400 + 205 + 96? (a) 800 (b) 600 (c) 900 (d) 700
  5. 5.Round 20945 to the nearest thousand.
  6. 6.Which is closest to 903 × 29? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  7. 7.Which is closest to 703 + 397 + 400? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  8. 8.Which is closest to 805 + 298 + 397? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  9. 9.Which is closest to 403 + 202 + 896? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  10. 10.Which is closest to 1492 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  11. 11.Round 60220 to the nearest hundred.
  12. 12.Which is closest to 798 × 88? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  13. 13.Which is closest to 605 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  14. 14.Round 83273 to the nearest ten.
  15. 15.Which is closest to 2999 ÷ 51? (a) 120 (b) 30 (c) 600 (d) 60
  16. 16.Round 76.91 to one decimal place. =
  17. 17.Which is closest to 1193 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  18. 18.Round 95748 to the nearest hundred.
  19. 19.Which is closest to 301 × 69? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  20. 20.Which is closest to 200 × 29? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  21. 21.Which is closest to 395 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40
  22. 22.Which is closest to 898 × 68? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  23. 23.Which is closest to 497 + 805 + 802? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  24. 24.Round 86.22 to one decimal place. =
  25. 25.Which is closest to 899 × 49? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  26. 26.Round 13470 to the nearest hundred.
  27. 27.Which is closest to 896 + 299 + 796? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  28. 28.Which is closest to 404 × 41? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  29. 29.Which is closest to 1591 ÷ 19? (a) 40 (b) 800 (c) 80 (d) 160
  30. 30.Which is closest to 97 + 303 + 198? (a) 800 (b) 600 (c) 700 (d) 500
  31. 31.Which is closest to 1204 ÷ 19? (a) 600 (b) 60 (c) 30 (d) 120
  32. 32.Which is closest to 1405 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  33. 33.Round 97.62 to one decimal place. =
  34. 34.Which is closest to 1803 ÷ 19? (a) 45 (b) 90 (c) 900 (d) 180
  35. 35.Which is closest to 905 + 301 + 95? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  36. 36.Which is closest to 1602 ÷ 41? (a) 40 (b) 80 (c) 400 (d) 20
  37. 37.Which is closest to 900 + 203 + 99? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  38. 38.Round 12571 to the nearest ten.
  39. 39.Which is closest to 296 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  40. 40.Round 68.29 to one decimal place. =

Answer key

  1. 27000
  2. 70
  3. 70
  4. 700
  5. 21000
  6. 27000
  7. 1500
  8. 1500
  9. 1500
  10. 30
  11. 60200
  12. 72000
  13. 20
  14. 83270
  15. 60
  16. 76.9
  17. 40
  18. 95700
  19. 21000
  20. 6000
  21. 20
  22. 63000
  23. 2100
  24. 86.2
  25. 45000
  26. 13500
  27. 2000
  28. 16000
  29. 80
  30. 600
  31. 60
  32. 70
  33. 97.6
  34. 90
  35. 1300
  36. 40
  37. 1200
  38. 12570
  39. 27000
  40. 68.3

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