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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 145 · 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 400 × 22? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
  2. 2.Which is closest to 1399 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  3. 3.Which is closest to 302 × 42? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  4. 4.Round 90903 to the nearest hundred.
  5. 5.Which is closest to 203 + 98 + 304? (a) 700 (b) 800 (c) 500 (d) 600
  6. 6.Which is closest to 3592 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900
  7. 7.Round 45364 to the nearest ten.
  8. 8.Which is closest to 897 × 69? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  9. 9.Which is closest to 798 × 32? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  10. 10.Which is closest to 298 + 204 + 601? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  11. 11.Which is closest to 304 + 596 + 505? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  12. 12.Which is closest to 805 ÷ 41? (a) 200 (b) 40 (c) 10 (d) 20
  13. 13.Which is closest to 1806 ÷ 21? (a) 180 (b) 45 (c) 90 (d) 900
  14. 14.Round 26264 to the nearest ten.
  15. 15.Which is closest to 801 + 501 + 803? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  16. 16.Which is closest to 2499 ÷ 51? (a) 500 (b) 25 (c) 50 (d) 100
  17. 17.Which is closest to 204 × 40? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  18. 18.Which is closest to 197 + 105 + 204? (a) 400 (b) 500 (c) 700 (d) 600
  19. 19.Which is closest to 304 × 30? (Round each number first.) (a) 90000 (b) 900 (c) 18000 (d) 9000
  20. 20.Which is closest to 702 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  21. 21.Round 87.39 to one decimal place. =
  22. 22.Round 23732 to the nearest thousand.
  23. 23.Round 66.33 to one decimal place. =
  24. 24.Round 10.57 to one decimal place. =
  25. 25.Round 21298 to the nearest ten.
  26. 26.Round 19895 to the nearest hundred.
  27. 27.Round 57.36 to one decimal place. =
  28. 28.Which is closest to 2996 ÷ 51? (a) 30 (b) 600 (c) 120 (d) 60
  29. 29.Round 29829 to the nearest hundred.
  30. 30.Which is closest to 897 × 41? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  31. 31.Round 82.86 to one decimal place. =
  32. 32.Which is closest to 803 × 72? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  33. 33.Round 80.61 to one decimal place. =
  34. 34.Which is closest to 102 + 700 + 599? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  35. 35.Which is closest to 1506 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  36. 36.Which is closest to 702 + 705 + 901? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  37. 37.Which is closest to 196 + 703 + 804? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  38. 38.Round 23357 to the nearest thousand.
  39. 39.Which is closest to 594 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  40. 40.Which is closest to 396 × 42? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000

Answer key

  1. 8000
  2. 70
  3. 12000
  4. 90900
  5. 600
  6. 90
  7. 45360
  8. 63000
  9. 24000
  10. 1100
  11. 1400
  12. 20
  13. 90
  14. 26260
  15. 2100
  16. 50
  17. 8000
  18. 500
  19. 9000
  20. 49000
  21. 87.4
  22. 24000
  23. 66.3
  24. 10.6
  25. 21300
  26. 19900
  27. 57.4
  28. 60
  29. 29800
  30. 36000
  31. 82.9
  32. 56000
  33. 80.6
  34. 1400
  35. 50
  36. 2300
  37. 1700
  38. 23000
  39. 30
  40. 16000

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