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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 384 · 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 23103 to the nearest thousand.
  2. 2.Round 66888 to the nearest hundred.
  3. 3.Round 60.69 to one decimal place. =
  4. 4.Which is closest to 296 + 302 + 196? (a) 900 (b) 700 (c) 800 (d) 1000
  5. 5.Round 76.39 to one decimal place. =
  6. 6.Which is closest to 897 + 95 + 597? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  7. 7.Which is closest to 798 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  8. 8.Which is closest to 495 + 398 + 401? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  9. 9.Which is closest to 1605 ÷ 19? (a) 80 (b) 800 (c) 160 (d) 40
  10. 10.Round 16486 to the nearest thousand.
  11. 11.Round 79.33 to one decimal place. =
  12. 12.Which is closest to 1395 ÷ 19? (a) 70 (b) 700 (c) 35 (d) 140
  13. 13.Which is closest to 499 × 91? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  14. 14.Which is closest to 498 × 91? (Round each number first.) (a) 90000 (b) 4500 (c) 45000 (d) 450000
  15. 15.Which is closest to 395 + 203 + 400? (a) 1200 (b) 900 (c) 1100 (d) 1000
  16. 16.Round 41.66 to one decimal place. =
  17. 17.Round 14825 to the nearest hundred.
  18. 18.Which is closest to 501 × 89? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
  19. 19.Which is closest to 402 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  20. 20.Round 82.69 to one decimal place. =
  21. 21.Which is closest to 696 × 49? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  22. 22.Which is closest to 196 × 18? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  23. 23.Which is closest to 599 × 71? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  24. 24.Which is closest to 804 + 697 + 496? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  25. 25.Round 77.78 to one decimal place. =
  26. 26.Which is closest to 698 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  27. 27.Round 78326 to the nearest thousand.
  28. 28.Round 19768 to the nearest ten.
  29. 29.Round 15603 to the nearest hundred.
  30. 30.Round 25.24 to one decimal place. =
  31. 31.Which is closest to 808 ÷ 21? (a) 80 (b) 40 (c) 400 (d) 20
  32. 32.Which is closest to 3992 ÷ 49? (a) 160 (b) 80 (c) 40 (d) 800
  33. 33.Which is closest to 295 + 796 + 204? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  34. 34.Round 66.22 to one decimal place. =
  35. 35.Which is closest to 395 + 404 + 102? (a) 1000 (b) 1100 (c) 900 (d) 800
  36. 36.Which is closest to 299 × 82? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  37. 37.Round 3264 to the nearest ten.
  38. 38.Which is closest to 301 × 21? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  39. 39.Round 22.79 to one decimal place. =
  40. 40.Round 76562 to the nearest hundred.

Answer key

  1. 23000
  2. 66900
  3. 60.7
  4. 800
  5. 76.4
  6. 1600
  7. 16000
  8. 1300
  9. 80
  10. 16000
  11. 79.3
  12. 70
  13. 45000
  14. 45000
  15. 1000
  16. 41.7
  17. 14800
  18. 45000
  19. 8000
  20. 82.7
  21. 35000
  22. 4000
  23. 42000
  24. 2000
  25. 77.8
  26. 21000
  27. 78000
  28. 19770
  29. 15600
  30. 25.2
  31. 40
  32. 80
  33. 1300
  34. 66.2
  35. 900
  36. 24000
  37. 3260
  38. 6000
  39. 22.8
  40. 76600

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