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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 206 · 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 39712 to the nearest thousand.
  2. 2.Which is closest to 796 × 30? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  3. 3.Which is closest to 404 × 29? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  4. 4.Which is closest to 603 + 302 + 100? (a) 1100 (b) 900 (c) 1200 (d) 1000
  5. 5.Which is closest to 398 × 59? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  6. 6.Which is closest to 2495 ÷ 51? (a) 25 (b) 100 (c) 50 (d) 500
  7. 7.Round 59.51 to one decimal place. =
  8. 8.Which is closest to 801 + 302 + 103? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  9. 9.Which is closest to 901 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  10. 10.Round 56001 to the nearest ten.
  11. 11.Which is closest to 594 ÷ 19? (a) 60 (b) 15 (c) 300 (d) 30
  12. 12.Which is closest to 702 × 21? (Round each number first.) (a) 28000 (b) 14000 (c) 140000 (d) 1400
  13. 13.Which is closest to 1207 ÷ 19? (a) 120 (b) 30 (c) 600 (d) 60
  14. 14.Which is closest to 398 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  15. 15.Round 13.94 to one decimal place. =
  16. 16.Round 94576 to the nearest thousand.
  17. 17.Round 38.84 to one decimal place. =
  18. 18.Which is closest to 698 + 96 + 297? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  19. 19.Round 79060 to the nearest hundred.
  20. 20.Which is closest to 198 + 598 + 896? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  21. 21.Which is closest to 699 + 400 + 901? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  22. 22.Round 36575 to the nearest hundred.
  23. 23.Which is closest to 597 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  24. 24.Which is closest to 495 + 296 + 899? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  25. 25.Which is closest to 398 + 105 + 900? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  26. 26.Which is closest to 197 × 48? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  27. 27.Which is closest to 197 × 31? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  28. 28.Round 10.37 to one decimal place. =
  29. 29.Round 12.26 to one decimal place. =
  30. 30.Round 63899 to the nearest hundred.
  31. 31.Round 58.52 to one decimal place. =
  32. 32.Round 22.32 to one decimal place. =
  33. 33.Which is closest to 698 × 20? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  34. 34.Which is closest to 1405 ÷ 19? (a) 700 (b) 35 (c) 140 (d) 70
  35. 35.Which is closest to 1601 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  36. 36.Which is closest to 2391 ÷ 31? (a) 160 (b) 80 (c) 800 (d) 40
  37. 37.Which is closest to 900 × 28? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  38. 38.Round 89.58 to one decimal place. =
  39. 39.Round 15459 to the nearest thousand.
  40. 40.Which is closest to 796 × 49? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000

Answer key

  1. 40000
  2. 24000
  3. 12000
  4. 1000
  5. 24000
  6. 50
  7. 59.5
  8. 1200
  9. 36000
  10. 56000
  11. 30
  12. 14000
  13. 60
  14. 12000
  15. 13.9
  16. 95000
  17. 38.8
  18. 1100
  19. 79100
  20. 1700
  21. 2000
  22. 36600
  23. 24000
  24. 1700
  25. 1400
  26. 10000
  27. 6000
  28. 10.4
  29. 12.3
  30. 63900
  31. 58.5
  32. 22.3
  33. 14000
  34. 70
  35. 40
  36. 80
  37. 27000
  38. 89.6
  39. 15000
  40. 40000

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