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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 535 · 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 205 + 399 + 204? (a) 800 (b) 1000 (c) 900 (d) 700
  2. 2.Which is closest to 602 + 904 + 396? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  3. 3.Which is closest to 897 ÷ 29? (a) 300 (b) 60 (c) 15 (d) 30
  4. 4.Which is closest to 1199 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  5. 5.Round 30.37 to one decimal place. =
  6. 6.Round 9999 to the nearest ten.
  7. 7.Round 95.39 to one decimal place. =
  8. 8.Round 96749 to the nearest thousand.
  9. 9.Round 99605 to the nearest hundred.
  10. 10.Round 20516 to the nearest hundred.
  11. 11.Which is closest to 903 × 81? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  12. 12.Which is closest to 896 × 89? (Round each number first.) (a) 81000 (b) 162000 (c) 8100 (d) 810000
  13. 13.Which is closest to 596 × 81? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  14. 14.Which is closest to 497 × 71? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  15. 15.Which is closest to 804 + 799 + 597? (a) 2400 (b) 2300 (c) 2100 (d) 2200
  16. 16.Round 67809 to the nearest ten.
  17. 17.Round 88.16 to one decimal place. =
  18. 18.Which is closest to 701 × 20? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  19. 19.Round 85726 to the nearest hundred.
  20. 20.Round 76.87 to one decimal place. =
  21. 21.Which is closest to 501 + 697 + 795? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  22. 22.Which is closest to 1502 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  23. 23.Which is closest to 705 + 397 + 697? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  24. 24.Which is closest to 697 + 195 + 202? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  25. 25.Which is closest to 100 + 203 + 104? (a) 500 (b) 400 (c) 300 (d) 600
  26. 26.Round 71860 to the nearest thousand.
  27. 27.Which is closest to 1493 ÷ 49? (a) 30 (b) 300 (c) 60 (d) 15
  28. 28.Which is closest to 499 × 68? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  29. 29.Which is closest to 703 × 60? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  30. 30.Round 56293 to the nearest hundred.
  31. 31.Which is closest to 1498 ÷ 29? (a) 100 (b) 500 (c) 50 (d) 25
  32. 32.Which is closest to 703 × 50? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  33. 33.Which is closest to 96 + 96 + 103? (a) 300 (b) 400 (c) 200 (d) 500
  34. 34.Which is closest to 299 + 397 + 502? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  35. 35.Which is closest to 401 × 80? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  36. 36.Round 63.08 to one decimal place. =
  37. 37.Which is closest to 2095 ÷ 29? (a) 35 (b) 140 (c) 700 (d) 70
  38. 38.Round 56.54 to one decimal place. =
  39. 39.Round 50022 to the nearest ten.
  40. 40.Round 27624 to the nearest hundred.

Answer key

  1. 800
  2. 1900
  3. 30
  4. 40
  5. 30.4
  6. 10000
  7. 95.4
  8. 97000
  9. 99600
  10. 20500
  11. 72000
  12. 81000
  13. 48000
  14. 35000
  15. 2200
  16. 67810
  17. 88.2
  18. 14000
  19. 85700
  20. 76.9
  21. 2000
  22. 30
  23. 1800
  24. 1100
  25. 400
  26. 72000
  27. 30
  28. 35000
  29. 42000
  30. 56300
  31. 50
  32. 35000
  33. 300
  34. 1200
  35. 32000
  36. 63.1
  37. 70
  38. 56.5
  39. 50020
  40. 27600

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