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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 284 · 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 1000 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  2. 2.Which is closest to 408 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  3. 3.Round 74.64 to one decimal place. =
  4. 4.Which is closest to 597 ÷ 19? (a) 60 (b) 30 (c) 300 (d) 15
  5. 5.Round 85667 to the nearest hundred.
  6. 6.Which is closest to 698 × 18? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  7. 7.Which is closest to 1806 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  8. 8.Which is closest to 297 × 51? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  9. 9.Which is closest to 696 × 22? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  10. 10.Which is closest to 598 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  11. 11.Round 80421 to the nearest ten.
  12. 12.Which is closest to 297 × 62? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  13. 13.Which is closest to 295 + 396 + 198? (a) 1000 (b) 1100 (c) 800 (d) 900
  14. 14.Round 53.33 to one decimal place. =
  15. 15.Round 30.27 to one decimal place. =
  16. 16.Which is closest to 899 × 19? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  17. 17.Round 71775 to the nearest hundred.
  18. 18.Which is closest to 704 × 20? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  19. 19.Which is closest to 604 × 42? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  20. 20.Round 84.82 to one decimal place. =
  21. 21.Which is closest to 895 + 96 + 704? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  22. 22.Round 38.81 to one decimal place. =
  23. 23.Which is closest to 805 + 397 + 401? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  24. 24.Round 17557 to the nearest thousand.
  25. 25.Which is closest to 497 × 89? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
  26. 26.Round 8049 to the nearest ten.
  27. 27.Which is closest to 196 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  28. 28.Which is closest to 2495 ÷ 49? (a) 500 (b) 25 (c) 50 (d) 100
  29. 29.Which is closest to 703 × 20? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  30. 30.Round 53217 to the nearest hundred.
  31. 31.Round 19781 to the nearest thousand.
  32. 32.Round 16.81 to one decimal place. =
  33. 33.Round 88.77 to one decimal place. =
  34. 34.Which is closest to 1208 ÷ 31? (a) 400 (b) 80 (c) 40 (d) 20
  35. 35.Round 10587 to the nearest thousand.
  36. 36.Round 11.17 to one decimal place. =
  37. 37.Which is closest to 597 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  38. 38.Which is closest to 196 × 49? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  39. 39.Which is closest to 403 × 21? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  40. 40.Which is closest to 196 + 595 + 200? (a) 900 (b) 1100 (c) 1200 (d) 1000

Answer key

  1. 50
  2. 20
  3. 74.6
  4. 30
  5. 85700
  6. 14000
  7. 90
  8. 15000
  9. 14000
  10. 30
  11. 80420
  12. 18000
  13. 900
  14. 53.3
  15. 30.3
  16. 18000
  17. 71800
  18. 14000
  19. 24000
  20. 84.8
  21. 1700
  22. 38.8
  23. 1600
  24. 18000
  25. 45000
  26. 8050
  27. 4000
  28. 50
  29. 14000
  30. 53200
  31. 20000
  32. 16.8
  33. 88.8
  34. 40
  35. 11000
  36. 11.2
  37. 54000
  38. 10000
  39. 8000
  40. 1000

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