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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 40 · 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 597 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  2. 2.Round 47738 to the nearest hundred.
  3. 3.Which is closest to 2007 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
  4. 4.Which is closest to 401 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  5. 5.Round 47.61 to one decimal place. =
  6. 6.Which is closest to 1599 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  7. 7.Round 93.88 to one decimal place. =
  8. 8.Which is closest to 804 × 82? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  9. 9.Which is closest to 196 + 804 + 204? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  10. 10.Round 60105 to the nearest hundred.
  11. 11.Round 38892 to the nearest hundred.
  12. 12.Which is closest to 401 × 29? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  13. 13.Which is closest to 3191 ÷ 39? (a) 160 (b) 800 (c) 40 (d) 80
  14. 14.Which is closest to 96 + 796 + 800? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  15. 15.Which is closest to 793 ÷ 19? (a) 20 (b) 400 (c) 80 (d) 40
  16. 16.Round 30.33 to one decimal place. =
  17. 17.Which is closest to 95 + 398 + 202? (a) 900 (b) 700 (c) 600 (d) 800
  18. 18.Which is closest to 3196 ÷ 41? (a) 800 (b) 160 (c) 80 (d) 40
  19. 19.Which is closest to 1996 ÷ 39? (a) 100 (b) 50 (c) 500 (d) 25
  20. 20.Which is closest to 791 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  21. 21.Round 79374 to the nearest ten.
  22. 22.Which is closest to 704 + 196 + 197? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  23. 23.Round 1278 to the nearest ten.
  24. 24.Round 82.64 to one decimal place. =
  25. 25.Round 25.61 to one decimal place. =
  26. 26.Round 13125 to the nearest thousand.
  27. 27.Round 79687 to the nearest hundred.
  28. 28.Round 20.06 to one decimal place. =
  29. 29.Which is closest to 595 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  30. 30.Which is closest to 801 ÷ 19? (a) 40 (b) 400 (c) 80 (d) 20
  31. 31.Round 72.94 to one decimal place. =
  32. 32.Round 79361 to the nearest ten.
  33. 33.Round 90596 to the nearest hundred.
  34. 34.Which is closest to 2793 ÷ 39? (a) 70 (b) 700 (c) 35 (d) 140
  35. 35.Which is closest to 297 × 79? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  36. 36.Round 51.22 to one decimal place. =
  37. 37.Which is closest to 301 × 80? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  38. 38.Round 41.17 to one decimal place. =
  39. 39.Which is closest to 498 × 72? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  40. 40.Which is closest to 301 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000

Answer key

  1. 30
  2. 47700
  3. 40
  4. 20
  5. 47.6
  6. 40
  7. 93.9
  8. 64000
  9. 1200
  10. 60100
  11. 38900
  12. 12000
  13. 80
  14. 1700
  15. 40
  16. 30.3
  17. 700
  18. 80
  19. 50
  20. 20
  21. 79370
  22. 1100
  23. 1280
  24. 82.6
  25. 25.6
  26. 13000
  27. 79700
  28. 20.1
  29. 30
  30. 40
  31. 72.9
  32. 79360
  33. 90600
  34. 70
  35. 24000
  36. 51.2
  37. 24000
  38. 41.2
  39. 35000
  40. 6000

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