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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 125 · 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 53.42 to one decimal place. =
  2. 2.Which is closest to 797 + 404 + 605? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  3. 3.Round 37691 to the nearest ten.
  4. 4.Round 20132 to the nearest thousand.
  5. 5.Round 47375 to the nearest hundred.
  6. 6.Round 47.79 to one decimal place. =
  7. 7.Which is closest to 705 + 599 + 803? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  8. 8.Round 76074 to the nearest ten.
  9. 9.Which is closest to 1208 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  10. 10.Which is closest to 1198 ÷ 19? (a) 120 (b) 600 (c) 30 (d) 60
  11. 11.Which is closest to 196 × 90? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  12. 12.Round 44.34 to one decimal place. =
  13. 13.Round 24.72 to one decimal place. =
  14. 14.Round 62.67 to one decimal place. =
  15. 15.Which is closest to 604 × 20? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  16. 16.Round 24.43 to one decimal place. =
  17. 17.Which is closest to 1999 ÷ 41? (a) 25 (b) 500 (c) 100 (d) 50
  18. 18.Round 96756 to the nearest hundred.
  19. 19.Round 88315 to the nearest thousand.
  20. 20.Round 50269 to the nearest thousand.
  21. 21.Round 99.72 to one decimal place. =
  22. 22.Round 89759 to the nearest hundred.
  23. 23.Round 93.91 to one decimal place. =
  24. 24.Round 41239 to the nearest hundred.
  25. 25.Which is closest to 897 × 22? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  26. 26.Round 46.21 to one decimal place. =
  27. 27.Round 91.81 to one decimal place. =
  28. 28.Round 70.61 to one decimal place. =
  29. 29.Which is closest to 803 + 599 + 202? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  30. 30.Which is closest to 798 × 18? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  31. 31.Round 94203 to the nearest hundred.
  32. 32.Which is closest to 401 × 50? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  33. 33.Round 82.46 to one decimal place. =
  34. 34.Which is closest to 304 × 78? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  35. 35.Round 15.57 to one decimal place. =
  36. 36.Round 10305 to the nearest hundred.
  37. 37.Which is closest to 395 + 800 + 897? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  38. 38.Which is closest to 808 ÷ 19? (a) 20 (b) 400 (c) 80 (d) 40
  39. 39.Which is closest to 1503 ÷ 49? (a) 60 (b) 30 (c) 15 (d) 300
  40. 40.Which is closest to 297 × 81? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000

Answer key

  1. 53.4
  2. 1800
  3. 37690
  4. 20000
  5. 47400
  6. 47.8
  7. 2100
  8. 76070
  9. 60
  10. 60
  11. 18000
  12. 44.3
  13. 24.7
  14. 62.7
  15. 12000
  16. 24.4
  17. 50
  18. 96800
  19. 88000
  20. 50000
  21. 99.7
  22. 89800
  23. 93.9
  24. 41200
  25. 18000
  26. 46.2
  27. 91.8
  28. 70.6
  29. 1600
  30. 16000
  31. 94200
  32. 20000
  33. 82.5
  34. 24000
  35. 15.6
  36. 10300
  37. 2100
  38. 40
  39. 30
  40. 24000

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