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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 875 · 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 295 + 295 + 903? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  2. 2.Round 57477 to the nearest thousand.
  3. 3.Round 24098 to the nearest hundred.
  4. 4.Which is closest to 202 + 502 + 896? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  5. 5.Round 19.34 to one decimal place. =
  6. 6.Round 97071 to the nearest hundred.
  7. 7.Which is closest to 1596 ÷ 19? (a) 80 (b) 160 (c) 800 (d) 40
  8. 8.Which is closest to 797 × 28? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  9. 9.Which is closest to 403 × 90? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  10. 10.Which is closest to 802 × 78? (Round each number first.) (a) 128000 (b) 6400 (c) 64000 (d) 640000
  11. 11.Which is closest to 903 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  12. 12.Which is closest to 202 + 598 + 905? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  13. 13.Round 51.42 to one decimal place. =
  14. 14.Which is closest to 2491 ÷ 51? (a) 100 (b) 50 (c) 500 (d) 25
  15. 15.Which is closest to 2003 ÷ 41? (a) 25 (b) 100 (c) 500 (d) 50
  16. 16.Round 32.27 to one decimal place. =
  17. 17.Which is closest to 303 + 198 + 900? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  18. 18.Which is closest to 2709 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  19. 19.Which is closest to 499 + 703 + 200? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  20. 20.Round 62537 to the nearest thousand.
  21. 21.Which is closest to 395 + 297 + 597? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  22. 22.Which is closest to 499 × 61? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  23. 23.Which is closest to 1605 ÷ 39? (a) 20 (b) 400 (c) 40 (d) 80
  24. 24.Round 83.63 to one decimal place. =
  25. 25.Round 40.51 to one decimal place. =
  26. 26.Round 93924 to the nearest ten.
  27. 27.Round 72.49 to one decimal place. =
  28. 28.Round 56443 to the nearest thousand.
  29. 29.Round 61.91 to one decimal place. =
  30. 30.Round 86565 to the nearest thousand.
  31. 31.Round 5701 to the nearest hundred.
  32. 32.Which is closest to 595 ÷ 21? (a) 15 (b) 300 (c) 60 (d) 30
  33. 33.Round 98.29 to one decimal place. =
  34. 34.Round 78.76 to one decimal place. =
  35. 35.Which is closest to 799 × 40? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  36. 36.Round 54.69 to one decimal place. =
  37. 37.Round 62.39 to one decimal place. =
  38. 38.Round 83.73 to one decimal place. =
  39. 39.Which is closest to 597 × 19? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  40. 40.Which is closest to 802 × 29? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000

Answer key

  1. 1500
  2. 57000
  3. 24100
  4. 1600
  5. 19.3
  6. 97100
  7. 80
  8. 24000
  9. 36000
  10. 64000
  11. 30
  12. 1700
  13. 51.4
  14. 50
  15. 50
  16. 32.3
  17. 1400
  18. 90
  19. 1400
  20. 63000
  21. 1300
  22. 30000
  23. 40
  24. 83.6
  25. 40.5
  26. 93920
  27. 72.5
  28. 56000
  29. 61.9
  30. 87000
  31. 5700
  32. 30
  33. 98.3
  34. 78.8
  35. 32000
  36. 54.7
  37. 62.4
  38. 83.7
  39. 12000
  40. 24000

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