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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 471 · 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 2396 ÷ 41? (a) 60 (b) 30 (c) 600 (d) 120
  2. 2.Round 30125 to the nearest hundred.
  3. 3.Which is closest to 405 + 102 + 704? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  4. 4.Which is closest to 102 + 297 + 302? (a) 900 (b) 600 (c) 700 (d) 800
  5. 5.Round 5615 to the nearest thousand.
  6. 6.Round 50.08 to one decimal place. =
  7. 7.Which is closest to 304 × 59? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  8. 8.Round 45393 to the nearest ten.
  9. 9.Which is closest to 2000 ÷ 51? (a) 80 (b) 400 (c) 40 (d) 20
  10. 10.Which is closest to 796 + 98 + 103? (a) 900 (b) 1100 (c) 1200 (d) 1000
  11. 11.Round 24902 to the nearest thousand.
  12. 12.Which is closest to 392 ÷ 19? (a) 10 (b) 200 (c) 40 (d) 20
  13. 13.Round 97.82 to one decimal place. =
  14. 14.Which is closest to 599 × 59? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  15. 15.Which is closest to 202 × 32? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
  16. 16.Which is closest to 805 + 303 + 296? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  17. 17.Round 26499 to the nearest ten.
  18. 18.Round 34.59 to one decimal place. =
  19. 19.Round 96732 to the nearest ten.
  20. 20.Which is closest to 897 × 89? (Round each number first.) (a) 8100 (b) 162000 (c) 81000 (d) 810000
  21. 21.Which is closest to 1794 ÷ 29? (a) 60 (b) 30 (c) 120 (d) 600
  22. 22.Which is closest to 703 × 89? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  23. 23.Which is closest to 298 × 28? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
  24. 24.Round 90.12 to one decimal place. =
  25. 25.Which is closest to 403 + 97 + 804? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  26. 26.Which is closest to 896 + 897 + 596? (a) 2500 (b) 2600 (c) 2400 (d) 2300
  27. 27.Which is closest to 804 × 32? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  28. 28.Which is closest to 401 + 396 + 198? (a) 900 (b) 1000 (c) 1200 (d) 1100
  29. 29.Which is closest to 498 × 79? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000
  30. 30.Round 59040 to the nearest thousand.
  31. 31.Round 26039 to the nearest hundred.
  32. 32.Which is closest to 593 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  33. 33.Which is closest to 601 ÷ 31? (a) 20 (b) 200 (c) 40 (d) 10
  34. 34.Round 7492 to the nearest thousand.
  35. 35.Round 53409 to the nearest ten.
  36. 36.Which is closest to 2407 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  37. 37.Round 6497 to the nearest ten.
  38. 38.Round 29447 to the nearest thousand.
  39. 39.Which is closest to 96 + 496 + 605? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  40. 40.Which is closest to 4501 ÷ 51? (a) 900 (b) 90 (c) 180 (d) 45

Answer key

  1. 60
  2. 30100
  3. 1200
  4. 700
  5. 6000
  6. 50.1
  7. 18000
  8. 45390
  9. 40
  10. 1000
  11. 25000
  12. 20
  13. 97.8
  14. 36000
  15. 6000
  16. 1400
  17. 26500
  18. 34.6
  19. 96730
  20. 81000
  21. 60
  22. 63000
  23. 9000
  24. 90.1
  25. 1300
  26. 2400
  27. 24000
  28. 1000
  29. 40000
  30. 59000
  31. 26000
  32. 20
  33. 20
  34. 7000
  35. 53410
  36. 80
  37. 6500
  38. 29000
  39. 1200
  40. 90

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