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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 555 · 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 596 + 98 + 95? (a) 700 (b) 800 (c) 900 (d) 1000
  2. 2.Round 18523 to the nearest ten.
  3. 3.Which is closest to 802 + 302 + 795? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  4. 4.Which is closest to 197 + 598 + 897? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  5. 5.Which is closest to 1809 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  6. 6.Which is closest to 899 × 71? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  7. 7.Which is closest to 204 × 49? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000
  8. 8.Which is closest to 702 + 96 + 599? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  9. 9.Which is closest to 3494 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  10. 10.Which is closest to 503 + 499 + 595? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  11. 11.Which is closest to 496 × 61? (Round each number first.) (a) 300000 (b) 30000 (c) 3000 (d) 60000
  12. 12.Which is closest to 605 + 596 + 799? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  13. 13.Round 45853 to the nearest ten.
  14. 14.Round 29961 to the nearest hundred.
  15. 15.Round 12969 to the nearest thousand.
  16. 16.Round 39.33 to one decimal place. =
  17. 17.Round 18.76 to one decimal place. =
  18. 18.Which is closest to 1807 ÷ 29? (a) 600 (b) 30 (c) 60 (d) 120
  19. 19.Which is closest to 2804 ÷ 41? (a) 35 (b) 140 (c) 700 (d) 70
  20. 20.Which is closest to 600 × 71? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  21. 21.Which is closest to 205 + 898 + 202? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  22. 22.Round 27.94 to one decimal place. =
  23. 23.Which is closest to 104 + 197 + 298? (a) 700 (b) 500 (c) 800 (d) 600
  24. 24.Which is closest to 804 + 201 + 202? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  25. 25.Round 94093 to the nearest ten.
  26. 26.Which is closest to 500 × 59? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  27. 27.Which is closest to 3506 ÷ 49? (a) 700 (b) 140 (c) 70 (d) 35
  28. 28.Which is closest to 601 × 22? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  29. 29.Round 68.89 to one decimal place. =
  30. 30.Round 15.29 to one decimal place. =
  31. 31.Which is closest to 597 × 39? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  32. 32.Round 90.39 to one decimal place. =
  33. 33.Round 35.08 to one decimal place. =
  34. 34.Which is closest to 397 + 205 + 397? (a) 900 (b) 1000 (c) 1200 (d) 1100
  35. 35.Round 21.88 to one decimal place. =
  36. 36.Which is closest to 496 + 98 + 897? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  37. 37.Which is closest to 503 × 81? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  38. 38.Which is closest to 404 × 89? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  39. 39.Which is closest to 1591 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  40. 40.Round 9762 to the nearest hundred.

Answer key

  1. 800
  2. 18520
  3. 1900
  4. 1700
  5. 90
  6. 63000
  7. 10000
  8. 1400
  9. 70
  10. 1600
  11. 30000
  12. 2000
  13. 45850
  14. 30000
  15. 13000
  16. 39.3
  17. 18.8
  18. 60
  19. 70
  20. 42000
  21. 1300
  22. 27.9
  23. 600
  24. 1200
  25. 94090
  26. 30000
  27. 70
  28. 12000
  29. 68.9
  30. 15.3
  31. 24000
  32. 90.4
  33. 35.1
  34. 1000
  35. 21.9
  36. 1500
  37. 40000
  38. 36000
  39. 80
  40. 9800

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