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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 989 · 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 62.39 to one decimal place. =
  2. 2.Round 50.66 to one decimal place. =
  3. 3.Round 62.66 to one decimal place. =
  4. 4.Round 36.92 to one decimal place. =
  5. 5.Which is closest to 804 + 802 + 501? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  6. 6.Round 29871 to the nearest ten.
  7. 7.Which is closest to 898 × 81? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  8. 8.Round 30809 to the nearest ten.
  9. 9.Round 41.77 to one decimal place. =
  10. 10.Which is closest to 801 + 600 + 196? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  11. 11.Round 27276 to the nearest hundred.
  12. 12.Which is closest to 698 × 52? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  13. 13.Round 65.31 to one decimal place. =
  14. 14.Which is closest to 702 × 39? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  15. 15.Which is closest to 699 + 195 + 602? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  16. 16.Round 44.47 to one decimal place. =
  17. 17.Which is closest to 197 + 500 + 705? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  18. 18.Which is closest to 1205 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  19. 19.Round 6850 to the nearest thousand.
  20. 20.Round 76598 to the nearest ten.
  21. 21.Which is closest to 404 × 71? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  22. 22.Which is closest to 901 × 52? (Round each number first.) (a) 45000 (b) 450000 (c) 90000 (d) 4500
  23. 23.Round 29.42 to one decimal place. =
  24. 24.Round 8026 to the nearest thousand.
  25. 25.Round 69.56 to one decimal place. =
  26. 26.Round 10872 to the nearest thousand.
  27. 27.Round 6716 to the nearest ten.
  28. 28.Round 98244 to the nearest hundred.
  29. 29.Which is closest to 299 × 38? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  30. 30.Round 39.56 to one decimal place. =
  31. 31.Which is closest to 1192 ÷ 41? (a) 15 (b) 300 (c) 30 (d) 60
  32. 32.Round 54.43 to one decimal place. =
  33. 33.Which is closest to 102 + 803 + 600? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  34. 34.Which is closest to 401 × 38? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  35. 35.Round 69.14 to one decimal place. =
  36. 36.Which is closest to 197 + 903 + 202? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  37. 37.Which is closest to 396 + 595 + 201? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  38. 38.Which is closest to 401 × 51? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  39. 39.Which is closest to 1799 ÷ 21? (a) 180 (b) 45 (c) 900 (d) 90
  40. 40.Which is closest to 504 × 58? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000

Answer key

  1. 62.4
  2. 50.7
  3. 62.7
  4. 36.9
  5. 2100
  6. 29870
  7. 72000
  8. 30810
  9. 41.8
  10. 1600
  11. 27300
  12. 35000
  13. 65.3
  14. 28000
  15. 1500
  16. 44.5
  17. 1400
  18. 40
  19. 7000
  20. 76600
  21. 28000
  22. 45000
  23. 29.4
  24. 8000
  25. 69.6
  26. 11000
  27. 6720
  28. 98200
  29. 12000
  30. 39.6
  31. 30
  32. 54.4
  33. 1500
  34. 16000
  35. 69.1
  36. 1300
  37. 1200
  38. 20000
  39. 90
  40. 30000

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