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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 160 · 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 403 × 79? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  2. 2.Round 36212 to the nearest hundred.
  3. 3.Round 59108 to the nearest thousand.
  4. 4.Which is closest to 3202 ÷ 39? (a) 80 (b) 800 (c) 160 (d) 40
  5. 5.Round 93.61 to one decimal place. =
  6. 6.Round 41.08 to one decimal place. =
  7. 7.Round 14.83 to one decimal place. =
  8. 8.Which is closest to 801 + 97 + 300? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  9. 9.Which is closest to 204 + 104 + 695? (a) 1100 (b) 900 (c) 1000 (d) 1200
  10. 10.Which is closest to 96 + 601 + 204? (a) 900 (b) 800 (c) 1100 (d) 1000
  11. 11.Round 38.39 to one decimal place. =
  12. 12.Which is closest to 1797 ÷ 21? (a) 900 (b) 45 (c) 90 (d) 180
  13. 13.Round 56.88 to one decimal place. =
  14. 14.Which is closest to 401 × 71? (Round each number first.) (a) 280000 (b) 28000 (c) 2800 (d) 56000
  15. 15.Which is closest to 199 + 397 + 198? (a) 1000 (b) 700 (c) 900 (d) 800
  16. 16.Which is closest to 798 ÷ 39? (a) 10 (b) 40 (c) 20 (d) 200
  17. 17.Round 53.92 to one decimal place. =
  18. 18.Which is closest to 98 + 596 + 103? (a) 900 (b) 1000 (c) 800 (d) 700
  19. 19.Round 90119 to the nearest ten.
  20. 20.Round 57386 to the nearest ten.
  21. 21.Which is closest to 405 + 697 + 103? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  22. 22.Round 16629 to the nearest hundred.
  23. 23.Which is closest to 501 + 701 + 804? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  24. 24.Which is closest to 1796 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  25. 25.Which is closest to 299 + 96 + 803? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  26. 26.Which is closest to 808 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  27. 27.Which is closest to 895 + 895 + 101? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  28. 28.Which is closest to 701 × 49? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  29. 29.Which is closest to 995 ÷ 21? (a) 50 (b) 25 (c) 500 (d) 100
  30. 30.Which is closest to 105 + 98 + 804? (a) 1200 (b) 1000 (c) 1100 (d) 900
  31. 31.Which is closest to 195 + 398 + 99? (a) 600 (b) 700 (c) 800 (d) 900
  32. 32.Which is closest to 895 + 397 + 295? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  33. 33.Which is closest to 196 × 19? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
  34. 34.Round 23.22 to one decimal place. =
  35. 35.Round 23.52 to one decimal place. =
  36. 36.Round 9160 to the nearest hundred.
  37. 37.Round 17.79 to one decimal place. =
  38. 38.Round 5045 to the nearest hundred.
  39. 39.Which is closest to 96 + 404 + 396? (a) 800 (b) 900 (c) 1000 (d) 1100
  40. 40.Which is closest to 498 × 31? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000

Answer key

  1. 32000
  2. 36200
  3. 59000
  4. 80
  5. 93.6
  6. 41.1
  7. 14.8
  8. 1200
  9. 1000
  10. 900
  11. 38.4
  12. 90
  13. 56.9
  14. 28000
  15. 800
  16. 20
  17. 53.9
  18. 800
  19. 90120
  20. 57390
  21. 1200
  22. 16600
  23. 2000
  24. 90
  25. 1200
  26. 40
  27. 1900
  28. 35000
  29. 50
  30. 1000
  31. 700
  32. 1600
  33. 4000
  34. 23.2
  35. 23.5
  36. 9200
  37. 17.8
  38. 5000
  39. 900
  40. 15000

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