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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 750 · 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 1599 ÷ 21? (a) 40 (b) 800 (c) 160 (d) 80
  2. 2.Round 99049 to the nearest hundred.
  3. 3.Which is closest to 600 ÷ 21? (a) 15 (b) 60 (c) 300 (d) 30
  4. 4.Which is closest to 897 + 901 + 701? (a) 2600 (b) 2500 (c) 2700 (d) 2400
  5. 5.Which is closest to 605 + 500 + 700? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  6. 6.Round 81.12 to one decimal place. =
  7. 7.Round 19953 to the nearest hundred.
  8. 8.Which is closest to 204 + 296 + 97? (a) 500 (b) 800 (c) 600 (d) 700
  9. 9.Which is closest to 201 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  10. 10.Round 65.68 to one decimal place. =
  11. 11.Round 24982 to the nearest hundred.
  12. 12.Which is closest to 797 + 700 + 504? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  13. 13.Which is closest to 400 + 297 + 800? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  14. 14.Round 93.57 to one decimal place. =
  15. 15.Round 70.12 to one decimal place. =
  16. 16.Which is closest to 3493 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  17. 17.Round 27.89 to one decimal place. =
  18. 18.Round 23.33 to one decimal place. =
  19. 19.Which is closest to 300 + 603 + 404? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  20. 20.Round 47.19 to one decimal place. =
  21. 21.Which is closest to 696 × 58? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  22. 22.Which is closest to 396 × 81? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  23. 23.Round 87.56 to one decimal place. =
  24. 24.Which is closest to 3196 ÷ 41? (a) 160 (b) 80 (c) 800 (d) 40
  25. 25.Round 77.31 to one decimal place. =
  26. 26.Round 30106 to the nearest thousand.
  27. 27.Round 98435 to the nearest thousand.
  28. 28.Which is closest to 201 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  29. 29.Which is closest to 502 + 299 + 598? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  30. 30.Which is closest to 701 × 41? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  31. 31.Which is closest to 296 × 49? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  32. 32.Which is closest to 897 × 68? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  33. 33.Round 52.89 to one decimal place. =
  34. 34.Round 62433 to the nearest hundred.
  35. 35.Which is closest to 604 + 98 + 698? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  36. 36.Round 17.49 to one decimal place. =
  37. 37.Round 45.41 to one decimal place. =
  38. 38.Which is closest to 3205 ÷ 41? (a) 80 (b) 40 (c) 800 (d) 160
  39. 39.Round 13778 to the nearest thousand.
  40. 40.Which is closest to 100 + 100 + 695? (a) 1000 (b) 1100 (c) 800 (d) 900

Answer key

  1. 80
  2. 99000
  3. 30
  4. 2500
  5. 1800
  6. 81.1
  7. 20000
  8. 600
  9. 18000
  10. 65.7
  11. 25000
  12. 2000
  13. 1500
  14. 93.6
  15. 70.1
  16. 70
  17. 27.9
  18. 23.3
  19. 1300
  20. 47.2
  21. 42000
  22. 32000
  23. 87.6
  24. 80
  25. 77.3
  26. 30000
  27. 98000
  28. 4000
  29. 1400
  30. 28000
  31. 15000
  32. 63000
  33. 52.9
  34. 62400
  35. 1400
  36. 17.5
  37. 45.4
  38. 80
  39. 14000
  40. 900

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