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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 761 · 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 16.32 to one decimal place. =
  2. 2.Which is closest to 2497 ÷ 49? (a) 25 (b) 500 (c) 50 (d) 100
  3. 3.Round 83997 to the nearest thousand.
  4. 4.Which is closest to 1991 ÷ 49? (a) 400 (b) 40 (c) 20 (d) 80
  5. 5.Which is closest to 502 + 196 + 695? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  6. 6.Which is closest to 1792 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  7. 7.Which is closest to 397 × 72? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  8. 8.Round 1837 to the nearest hundred.
  9. 9.Which is closest to 1599 ÷ 39? (a) 20 (b) 40 (c) 80 (d) 400
  10. 10.Which is closest to 798 × 52? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  11. 11.Which is closest to 899 + 202 + 205? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  12. 12.Which is closest to 602 × 92? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  13. 13.Which is closest to 900 + 203 + 703? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  14. 14.Which is closest to 502 × 38? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  15. 15.Which is closest to 405 ÷ 21? (a) 200 (b) 40 (c) 20 (d) 10
  16. 16.Which is closest to 797 + 303 + 401? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  17. 17.Round 23.59 to one decimal place. =
  18. 18.Round 29.41 to one decimal place. =
  19. 19.Round 37.81 to one decimal place. =
  20. 20.Which is closest to 195 + 202 + 499? (a) 1100 (b) 800 (c) 900 (d) 1000
  21. 21.Which is closest to 501 × 38? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  22. 22.Which is closest to 2803 ÷ 41? (a) 70 (b) 140 (c) 700 (d) 35
  23. 23.Round 37.64 to one decimal place. =
  24. 24.Which is closest to 305 + 700 + 97? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  25. 25.Which is closest to 299 × 78? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  26. 26.Round 44.76 to one decimal place. =
  27. 27.Round 38643 to the nearest thousand.
  28. 28.Round 81.36 to one decimal place. =
  29. 29.Round 91.91 to one decimal place. =
  30. 30.Which is closest to 596 × 18? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  31. 31.Round 41.58 to one decimal place. =
  32. 32.Which is closest to 302 × 48? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  33. 33.Which is closest to 897 × 19? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  34. 34.Which is closest to 598 + 902 + 600? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  35. 35.Which is closest to 798 × 59? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  36. 36.Round 51.81 to one decimal place. =
  37. 37.Round 58183 to the nearest thousand.
  38. 38.Round 48934 to the nearest thousand.
  39. 39.Round 60.77 to one decimal place. =
  40. 40.Round 13579 to the nearest hundred.

Answer key

  1. 16.3
  2. 50
  3. 84000
  4. 40
  5. 1400
  6. 60
  7. 28000
  8. 1800
  9. 40
  10. 40000
  11. 1300
  12. 54000
  13. 1800
  14. 20000
  15. 20
  16. 1500
  17. 23.6
  18. 29.4
  19. 37.8
  20. 900
  21. 20000
  22. 70
  23. 37.6
  24. 1100
  25. 24000
  26. 44.8
  27. 39000
  28. 81.4
  29. 91.9
  30. 12000
  31. 41.6
  32. 15000
  33. 18000
  34. 2100
  35. 48000
  36. 51.8
  37. 58000
  38. 49000
  39. 60.8
  40. 13600

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