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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 16 · 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 202 × 68? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  2. 2.Which is closest to 102 + 899 + 198? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  3. 3.Which is closest to 404 + 96 + 195? (a) 600 (b) 800 (c) 700 (d) 900
  4. 4.Which is closest to 895 + 495 + 695? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  5. 5.Round 3304 to the nearest hundred.
  6. 6.Which is closest to 202 + 99 + 204? (a) 600 (b) 400 (c) 500 (d) 700
  7. 7.Round 92.08 to one decimal place. =
  8. 8.Round 43.43 to one decimal place. =
  9. 9.Round 16933 to the nearest ten.
  10. 10.Round 83.54 to one decimal place. =
  11. 11.Which is closest to 4497 ÷ 49? (a) 90 (b) 45 (c) 180 (d) 900
  12. 12.Which is closest to 799 × 49? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  13. 13.Round 81482 to the nearest hundred.
  14. 14.Which is closest to 403 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  15. 15.Round 48538 to the nearest ten.
  16. 16.Which is closest to 1197 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60
  17. 17.Which is closest to 100 + 597 + 96? (a) 900 (b) 1000 (c) 800 (d) 700
  18. 18.Which is closest to 1209 ÷ 21? (a) 30 (b) 600 (c) 60 (d) 120
  19. 19.Which is closest to 301 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 18000 (d) 900
  20. 20.Which is closest to 496 × 88? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  21. 21.Round 92.59 to one decimal place. =
  22. 22.Which is closest to 997 ÷ 51? (a) 20 (b) 200 (c) 40 (d) 10
  23. 23.Round 15.33 to one decimal place. =
  24. 24.Which is closest to 397 × 51? (Round each number first.) (a) 2000 (b) 20000 (c) 40000 (d) 200000
  25. 25.Which is closest to 296 × 61? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  26. 26.Which is closest to 497 × 61? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  27. 27.Round 81.69 to one decimal place. =
  28. 28.Round 85910 to the nearest hundred.
  29. 29.Which is closest to 197 × 62? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  30. 30.Round 24947 to the nearest thousand.
  31. 31.Which is closest to 803 × 82? (Round each number first.) (a) 128000 (b) 6400 (c) 64000 (d) 640000
  32. 32.Which is closest to 705 + 903 + 503? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  33. 33.Which is closest to 806 ÷ 41? (a) 10 (b) 40 (c) 20 (d) 200
  34. 34.Round 1317 to the nearest ten.
  35. 35.Which is closest to 2396 ÷ 41? (a) 30 (b) 60 (c) 120 (d) 600
  36. 36.Which is closest to 405 + 705 + 400? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  37. 37.Which is closest to 599 × 28? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  38. 38.Which is closest to 699 + 497 + 195? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  39. 39.Round 21532 to the nearest thousand.
  40. 40.Which is closest to 200 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000

Answer key

  1. 14000
  2. 1200
  3. 700
  4. 2100
  5. 3300
  6. 500
  7. 92.1
  8. 43.4
  9. 16930
  10. 83.5
  11. 90
  12. 40000
  13. 81500
  14. 12000
  15. 48540
  16. 60
  17. 800
  18. 60
  19. 9000
  20. 45000
  21. 92.6
  22. 20
  23. 15.3
  24. 20000
  25. 18000
  26. 30000
  27. 81.7
  28. 85900
  29. 12000
  30. 25000
  31. 64000
  32. 2100
  33. 20
  34. 1320
  35. 60
  36. 1500
  37. 18000
  38. 1400
  39. 22000
  40. 12000

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