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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 71 · 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 7979 to the nearest ten.
  2. 2.Round 21.83 to one decimal place. =
  3. 3.Which is closest to 503 + 905 + 902? (a) 2200 (b) 2400 (c) 2500 (d) 2300
  4. 4.Which is closest to 994 ÷ 49? (a) 200 (b) 40 (c) 10 (d) 20
  5. 5.Which is closest to 398 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  6. 6.Which is closest to 802 ÷ 39? (a) 10 (b) 20 (c) 200 (d) 40
  7. 7.Which is closest to 1808 ÷ 31? (a) 120 (b) 60 (c) 30 (d) 600
  8. 8.Round 53.88 to one decimal place. =
  9. 9.Which is closest to 906 ÷ 31? (a) 30 (b) 60 (c) 15 (d) 300
  10. 10.Round 85.07 to one decimal place. =
  11. 11.Which is closest to 598 × 69? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  12. 12.Which is closest to 605 + 902 + 100? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  13. 13.Which is closest to 1198 ÷ 39? (a) 300 (b) 15 (c) 60 (d) 30
  14. 14.Which is closest to 303 × 81? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  15. 15.Round 64.06 to one decimal place. =
  16. 16.Which is closest to 4508 ÷ 49? (a) 180 (b) 900 (c) 45 (d) 90
  17. 17.Which is closest to 802 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  18. 18.Which is closest to 302 × 70? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  19. 19.Which is closest to 899 + 699 + 205? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  20. 20.Which is closest to 698 × 18? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  21. 21.Round 56.94 to one decimal place. =
  22. 22.Round 6657 to the nearest thousand.
  23. 23.Round 24.81 to one decimal place. =
  24. 24.Which is closest to 402 × 89? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  25. 25.Which is closest to 499 × 78? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  26. 26.Which is closest to 2100 ÷ 29? (a) 35 (b) 70 (c) 700 (d) 140
  27. 27.Round 11.84 to one decimal place. =
  28. 28.Round 93.57 to one decimal place. =
  29. 29.Which is closest to 2397 ÷ 39? (a) 30 (b) 60 (c) 600 (d) 120
  30. 30.Which is closest to 804 × 40? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  31. 31.Which is closest to 904 + 98 + 595? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  32. 32.Round 73.64 to one decimal place. =
  33. 33.Which is closest to 1795 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  34. 34.Which is closest to 405 ÷ 19? (a) 10 (b) 20 (c) 40 (d) 200
  35. 35.Round 35589 to the nearest ten.
  36. 36.Which is closest to 696 × 38? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  37. 37.Which is closest to 1204 ÷ 21? (a) 60 (b) 120 (c) 30 (d) 600
  38. 38.Round 66274 to the nearest ten.
  39. 39.Round 51.26 to one decimal place. =
  40. 40.Round 74.66 to one decimal place. =

Answer key

  1. 7980
  2. 21.8
  3. 2300
  4. 20
  5. 20
  6. 20
  7. 60
  8. 53.9
  9. 30
  10. 85.1
  11. 42000
  12. 1600
  13. 30
  14. 24000
  15. 64.1
  16. 90
  17. 24000
  18. 21000
  19. 1800
  20. 14000
  21. 56.9
  22. 7000
  23. 24.8
  24. 36000
  25. 40000
  26. 70
  27. 11.8
  28. 93.6
  29. 60
  30. 32000
  31. 1600
  32. 73.6
  33. 60
  34. 20
  35. 35590
  36. 28000
  37. 60
  38. 66270
  39. 51.3
  40. 74.7

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