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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 698 · 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 15.79 to one decimal place. =
  2. 2.Which is closest to 1599 ÷ 41? (a) 400 (b) 40 (c) 20 (d) 80
  3. 3.Which is closest to 695 + 799 + 103? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  4. 4.Which is closest to 302 × 60? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  5. 5.Round 71537 to the nearest ten.
  6. 6.Round 91879 to the nearest hundred.
  7. 7.Which is closest to 1993 ÷ 49? (a) 40 (b) 80 (c) 20 (d) 400
  8. 8.Round 80352 to the nearest ten.
  9. 9.Round 52.08 to one decimal place. =
  10. 10.Which is closest to 501 + 699 + 204? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  11. 11.Which is closest to 404 + 504 + 596? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  12. 12.Which is closest to 895 + 898 + 97? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  13. 13.Round 34.16 to one decimal place. =
  14. 14.Round 47214 to the nearest ten.
  15. 15.Round 19.31 to one decimal place. =
  16. 16.Which is closest to 204 × 48? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  17. 17.Which is closest to 698 × 20? (Round each number first.) (a) 14000 (b) 140000 (c) 1400 (d) 28000
  18. 18.Round 68898 to the nearest hundred.
  19. 19.Which is closest to 305 + 899 + 704? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  20. 20.Which is closest to 303 × 82? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  21. 21.Which is closest to 403 + 199 + 905? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  22. 22.Round 75.43 to one decimal place. =
  23. 23.Which is closest to 399 × 32? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  24. 24.Round 70067 to the nearest thousand.
  25. 25.Which is closest to 2002 ÷ 41? (a) 25 (b) 500 (c) 100 (d) 50
  26. 26.Which is closest to 1192 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  27. 27.Round 65.09 to one decimal place. =
  28. 28.Which is closest to 2403 ÷ 39? (a) 60 (b) 600 (c) 30 (d) 120
  29. 29.Which is closest to 699 × 21? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  30. 30.Round 35206 to the nearest thousand.
  31. 31.Round 48.84 to one decimal place. =
  32. 32.Round 98.39 to one decimal place. =
  33. 33.Which is closest to 2496 ÷ 49? (a) 25 (b) 50 (c) 500 (d) 100
  34. 34.Round 3497 to the nearest hundred.
  35. 35.Which is closest to 198 + 402 + 595? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  36. 36.Which is closest to 898 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  37. 37.Which is closest to 796 + 303 + 295? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  38. 38.Which is closest to 403 × 21? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  39. 39.Which is closest to 300 + 400 + 295? (a) 1100 (b) 1000 (c) 1200 (d) 900
  40. 40.Which is closest to 2509 ÷ 49? (a) 500 (b) 50 (c) 25 (d) 100

Answer key

  1. 15.8
  2. 40
  3. 1600
  4. 18000
  5. 71540
  6. 91900
  7. 40
  8. 80350
  9. 52.1
  10. 1400
  11. 1500
  12. 1900
  13. 34.2
  14. 47210
  15. 19.3
  16. 10000
  17. 14000
  18. 68900
  19. 1900
  20. 24000
  21. 1500
  22. 75.4
  23. 12000
  24. 70000
  25. 50
  26. 40
  27. 65.1
  28. 60
  29. 14000
  30. 35000
  31. 48.8
  32. 98.4
  33. 50
  34. 3500
  35. 1200
  36. 36000
  37. 1400
  38. 8000
  39. 1000
  40. 50

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