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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 500 · 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 396 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  2. 2.Which is closest to 1802 ÷ 21? (a) 45 (b) 180 (c) 900 (d) 90
  3. 3.Which is closest to 805 + 601 + 201? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  4. 4.Which is closest to 202 × 81? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  5. 5.Round 27.64 to one decimal place. =
  6. 6.Which is closest to 304 + 698 + 103? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  7. 7.Which is closest to 303 × 40? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  8. 8.Which is closest to 104 + 203 + 798? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  9. 9.Which is closest to 796 + 197 + 199? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  10. 10.Round 82.63 to one decimal place. =
  11. 11.Which is closest to 401 × 50? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  12. 12.Round 56599 to the nearest hundred.
  13. 13.Which is closest to 197 + 504 + 496? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  14. 14.Which is closest to 695 + 403 + 205? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  15. 15.Round 63.19 to one decimal place. =
  16. 16.Which is closest to 2709 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
  17. 17.Round 37.64 to one decimal place. =
  18. 18.Which is closest to 1809 ÷ 29? (a) 60 (b) 120 (c) 30 (d) 600
  19. 19.Which is closest to 201 × 92? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  20. 20.Round 26.23 to one decimal place. =
  21. 21.Which is closest to 804 ÷ 39? (a) 20 (b) 10 (c) 40 (d) 200
  22. 22.Which is closest to 604 × 22? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  23. 23.Round 25.94 to one decimal place. =
  24. 24.Round 31133 to the nearest hundred.
  25. 25.Round 99487 to the nearest thousand.
  26. 26.Which is closest to 204 + 96 + 902? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  27. 27.Round 33770 to the nearest thousand.
  28. 28.Which is closest to 97 + 295 + 398? (a) 1000 (b) 800 (c) 700 (d) 900
  29. 29.Which is closest to 604 × 41? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  30. 30.Which is closest to 402 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  31. 31.Which is closest to 496 × 18? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  32. 32.Round 62.49 to one decimal place. =
  33. 33.Round 33.22 to one decimal place. =
  34. 34.Which is closest to 199 × 19? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  35. 35.Which is closest to 702 × 49? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  36. 36.Round 28.74 to one decimal place. =
  37. 37.Which is closest to 896 × 90? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  38. 38.Which is closest to 805 ÷ 19? (a) 80 (b) 20 (c) 40 (d) 400
  39. 39.Round 8156 to the nearest hundred.
  40. 40.Which is closest to 95 + 200 + 295? (a) 600 (b) 500 (c) 800 (d) 700

Answer key

  1. 12000
  2. 90
  3. 1600
  4. 16000
  5. 27.6
  6. 1100
  7. 12000
  8. 1100
  9. 1200
  10. 82.6
  11. 20000
  12. 56600
  13. 1200
  14. 1300
  15. 63.2
  16. 90
  17. 37.6
  18. 60
  19. 18000
  20. 26.2
  21. 20
  22. 12000
  23. 25.9
  24. 31100
  25. 99000
  26. 1200
  27. 34000
  28. 800
  29. 24000
  30. 28000
  31. 10000
  32. 62.5
  33. 33.2
  34. 4000
  35. 35000
  36. 28.7
  37. 81000
  38. 40
  39. 8200
  40. 600

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