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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 825 · 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 297 × 58? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  2. 2.Which is closest to 701 + 597 + 99? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  3. 3.Round 35977 to the nearest hundred.
  4. 4.Which is closest to 403 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  5. 5.Which is closest to 505 + 502 + 599? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  6. 6.Which is closest to 801 × 80? (Round each number first.) (a) 640000 (b) 6400 (c) 128000 (d) 64000
  7. 7.Round 94.84 to one decimal place. =
  8. 8.Which is closest to 895 + 301 + 97? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  9. 9.Which is closest to 1007 ÷ 51? (a) 200 (b) 40 (c) 10 (d) 20
  10. 10.Which is closest to 497 × 18? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  11. 11.Round 56.81 to one decimal place. =
  12. 12.Which is closest to 501 + 803 + 304? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  13. 13.Round 67.71 to one decimal place. =
  14. 14.Round 98.13 to one decimal place. =
  15. 15.Which is closest to 602 + 900 + 398? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  16. 16.Which is closest to 795 + 900 + 804? (a) 2500 (b) 2400 (c) 2700 (d) 2600
  17. 17.Round 54619 to the nearest ten.
  18. 18.Which is closest to 4004 ÷ 49? (a) 80 (b) 160 (c) 40 (d) 800
  19. 19.Round 87.81 to one decimal place. =
  20. 20.Round 41.64 to one decimal place. =
  21. 21.Which is closest to 604 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  22. 22.Which is closest to 3997 ÷ 49? (a) 800 (b) 40 (c) 160 (d) 80
  23. 23.Which is closest to 696 × 88? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  24. 24.Round 16.38 to one decimal place. =
  25. 25.Which is closest to 1595 ÷ 21? (a) 160 (b) 800 (c) 80 (d) 40
  26. 26.Which is closest to 1499 ÷ 31? (a) 100 (b) 500 (c) 25 (d) 50
  27. 27.Which is closest to 393 ÷ 19? (a) 20 (b) 40 (c) 10 (d) 200
  28. 28.Which is closest to 903 × 52? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  29. 29.Which is closest to 398 + 700 + 99? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  30. 30.Which is closest to 598 + 404 + 698? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  31. 31.Round 69.06 to one decimal place. =
  32. 32.Round 75.81 to one decimal place. =
  33. 33.Which is closest to 304 + 203 + 198? (a) 900 (b) 800 (c) 700 (d) 600
  34. 34.Which is closest to 904 × 88? (Round each number first.) (a) 8100 (b) 162000 (c) 81000 (d) 810000
  35. 35.Which is closest to 203 + 599 + 697? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  36. 36.Which is closest to 1995 ÷ 51? (a) 40 (b) 400 (c) 20 (d) 80
  37. 37.Round 96657 to the nearest ten.
  38. 38.Round 60.76 to one decimal place. =
  39. 39.Round 69.37 to one decimal place. =
  40. 40.Round 20.56 to one decimal place. =

Answer key

  1. 18000
  2. 1400
  3. 36000
  4. 20
  5. 1600
  6. 64000
  7. 94.8
  8. 1300
  9. 20
  10. 10000
  11. 56.8
  12. 1600
  13. 67.7
  14. 98.1
  15. 1900
  16. 2500
  17. 54620
  18. 80
  19. 87.8
  20. 41.6
  21. 18000
  22. 80
  23. 63000
  24. 16.4
  25. 80
  26. 50
  27. 20
  28. 45000
  29. 1200
  30. 1700
  31. 69.1
  32. 75.8
  33. 700
  34. 81000
  35. 1500
  36. 40
  37. 96660
  38. 60.8
  39. 69.4
  40. 20.6

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