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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 209 · 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 13.32 to one decimal place. =
  2. 2.Round 14799 to the nearest thousand.
  3. 3.Which is closest to 201 + 201 + 901? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  4. 4.Which is closest to 597 × 89? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  5. 5.Round 38.87 to one decimal place. =
  6. 6.Round 49.36 to one decimal place. =
  7. 7.Which is closest to 1192 ÷ 19? (a) 120 (b) 60 (c) 30 (d) 600
  8. 8.Which is closest to 198 + 604 + 400? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  9. 9.Which is closest to 408 ÷ 19? (a) 200 (b) 20 (c) 10 (d) 40
  10. 10.Round 71.56 to one decimal place. =
  11. 11.Round 81999 to the nearest ten.
  12. 12.Which is closest to 797 + 397 + 401? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  13. 13.Round 20225 to the nearest hundred.
  14. 14.Which is closest to 202 + 799 + 899? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  15. 15.Which is closest to 2003 ÷ 51? (a) 80 (b) 20 (c) 40 (d) 400
  16. 16.Which is closest to 799 × 18? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  17. 17.Which is closest to 699 + 201 + 299? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  18. 18.Which is closest to 504 + 104 + 401? (a) 1000 (b) 900 (c) 1100 (d) 1200
  19. 19.Which is closest to 197 + 604 + 701? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  20. 20.Round 13529 to the nearest hundred.
  21. 21.Which is closest to 3007 ÷ 51? (a) 600 (b) 60 (c) 120 (d) 30
  22. 22.Which is closest to 2791 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  23. 23.Which is closest to 1193 ÷ 29? (a) 20 (b) 80 (c) 400 (d) 40
  24. 24.Which is closest to 296 + 304 + 804? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  25. 25.Round 99.77 to one decimal place. =
  26. 26.Which is closest to 809 ÷ 39? (a) 10 (b) 20 (c) 40 (d) 200
  27. 27.Which is closest to 404 × 32? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  28. 28.Which is closest to 803 × 68? (Round each number first.) (a) 112000 (b) 56000 (c) 5600 (d) 560000
  29. 29.Which is closest to 199 × 28? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  30. 30.Round 41.33 to one decimal place. =
  31. 31.Round 57.31 to one decimal place. =
  32. 32.Round 18.87 to one decimal place. =
  33. 33.Which is closest to 498 × 60? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  34. 34.Round 16.21 to one decimal place. =
  35. 35.Which is closest to 1991 ÷ 51? (a) 80 (b) 400 (c) 40 (d) 20
  36. 36.Which is closest to 495 + 895 + 797? (a) 2200 (b) 2400 (c) 2300 (d) 2100
  37. 37.Which is closest to 1401 ÷ 19? (a) 140 (b) 35 (c) 700 (d) 70
  38. 38.Which is closest to 601 × 89? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  39. 39.Which is closest to 1393 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  40. 40.Round 49.51 to one decimal place. =

Answer key

  1. 13.3
  2. 15000
  3. 1300
  4. 54000
  5. 38.9
  6. 49.4
  7. 60
  8. 1200
  9. 20
  10. 71.6
  11. 82000
  12. 1600
  13. 20200
  14. 1900
  15. 40
  16. 16000
  17. 1200
  18. 1000
  19. 1500
  20. 13500
  21. 60
  22. 70
  23. 40
  24. 1400
  25. 99.8
  26. 20
  27. 12000
  28. 56000
  29. 6000
  30. 41.3
  31. 57.3
  32. 18.9
  33. 30000
  34. 16.2
  35. 40
  36. 2200
  37. 70
  38. 54000
  39. 70
  40. 49.5

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