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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 478 · 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 37.38 to one decimal place. =
  2. 2.Which is closest to 398 × 32? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  3. 3.Round 37.56 to one decimal place. =
  4. 4.Round 28844 to the nearest ten.
  5. 5.Which is closest to 791 ÷ 39? (a) 40 (b) 20 (c) 200 (d) 10
  6. 6.Which is closest to 504 + 598 + 397? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  7. 7.Round 34.11 to one decimal place. =
  8. 8.Which is closest to 397 × 48? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  9. 9.Round 85.13 to one decimal place. =
  10. 10.Round 11.42 to one decimal place. =
  11. 11.Which is closest to 1001 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  12. 12.Which is closest to 204 × 92? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  13. 13.Round 21.79 to one decimal place. =
  14. 14.Round 25.87 to one decimal place. =
  15. 15.Which is closest to 802 × 49? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  16. 16.Which is closest to 3492 ÷ 49? (a) 70 (b) 140 (c) 700 (d) 35
  17. 17.Which is closest to 499 × 78? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  18. 18.Round 97.39 to one decimal place. =
  19. 19.Round 20.79 to one decimal place. =
  20. 20.Round 98.08 to one decimal place. =
  21. 21.Which is closest to 2399 ÷ 31? (a) 80 (b) 40 (c) 160 (d) 800
  22. 22.Which is closest to 198 × 31? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  23. 23.Round 28815 to the nearest hundred.
  24. 24.Round 78197 to the nearest ten.
  25. 25.Which is closest to 1200 ÷ 41? (a) 300 (b) 15 (c) 60 (d) 30
  26. 26.Which is closest to 200 + 204 + 101? (a) 600 (b) 500 (c) 400 (d) 700
  27. 27.Round 18.61 to one decimal place. =
  28. 28.Round 30.17 to one decimal place. =
  29. 29.Which is closest to 906 ÷ 29? (a) 15 (b) 30 (c) 60 (d) 300
  30. 30.Round 15.63 to one decimal place. =
  31. 31.Round 15756 to the nearest thousand.
  32. 32.Which is closest to 697 × 18? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  33. 33.Round 3340 to the nearest thousand.
  34. 34.Which is closest to 2703 ÷ 29? (a) 900 (b) 90 (c) 45 (d) 180
  35. 35.Which is closest to 408 ÷ 19? (a) 10 (b) 20 (c) 40 (d) 200
  36. 36.Round 50.32 to one decimal place. =
  37. 37.Which is closest to 801 + 404 + 402? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  38. 38.Round 73.19 to one decimal place. =
  39. 39.Round 26.26 to one decimal place. =
  40. 40.Which is closest to 2391 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120

Answer key

  1. 37.4
  2. 12000
  3. 37.6
  4. 28840
  5. 20
  6. 1500
  7. 34.1
  8. 20000
  9. 85.1
  10. 11.4
  11. 20
  12. 18000
  13. 21.8
  14. 25.9
  15. 40000
  16. 70
  17. 40000
  18. 97.4
  19. 20.8
  20. 98.1
  21. 80
  22. 6000
  23. 28800
  24. 78200
  25. 30
  26. 500
  27. 18.6
  28. 30.2
  29. 30
  30. 15.6
  31. 16000
  32. 14000
  33. 3000
  34. 90
  35. 20
  36. 50.3
  37. 1600
  38. 73.2
  39. 26.3
  40. 60

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