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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 735 · 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 18456 to the nearest thousand.
  2. 2.Which is closest to 499 + 902 + 700? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  3. 3.Which is closest to 2396 ÷ 29? (a) 40 (b) 160 (c) 80 (d) 800
  4. 4.Which is closest to 904 × 48? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  5. 5.Which is closest to 903 × 41? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  6. 6.Which is closest to 801 × 69? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  7. 7.Which is closest to 402 + 295 + 702? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  8. 8.Which is closest to 996 ÷ 21? (a) 50 (b) 25 (c) 100 (d) 500
  9. 9.Which is closest to 496 × 68? (Round each number first.) (a) 70000 (b) 350000 (c) 3500 (d) 35000
  10. 10.Round 21.56 to one decimal place. =
  11. 11.Round 10417 to the nearest ten.
  12. 12.Which is closest to 797 × 29? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  13. 13.Which is closest to 98 + 803 + 100? (a) 1100 (b) 1200 (c) 900 (d) 1000
  14. 14.Which is closest to 896 × 29? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  15. 15.Which is closest to 204 × 48? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  16. 16.Round 18.67 to one decimal place. =
  17. 17.Round 86123 to the nearest ten.
  18. 18.Which is closest to 100 + 899 + 604? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  19. 19.Round 17.29 to one decimal place. =
  20. 20.Round 24.37 to one decimal place. =
  21. 21.Which is closest to 896 × 80? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  22. 22.Which is closest to 1504 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  23. 23.Which is closest to 200 × 68? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  24. 24.Round 24.49 to one decimal place. =
  25. 25.Round 79.63 to one decimal place. =
  26. 26.Which is closest to 600 × 21? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  27. 27.Round 26.16 to one decimal place. =
  28. 28.Round 73.44 to one decimal place. =
  29. 29.Which is closest to 796 + 198 + 96? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  30. 30.Which is closest to 596 × 68? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  31. 31.Round 35769 to the nearest hundred.
  32. 32.Which is closest to 1805 ÷ 19? (a) 45 (b) 180 (c) 90 (d) 900
  33. 33.Round 49.11 to one decimal place. =
  34. 34.Round 55.09 to one decimal place. =
  35. 35.Which is closest to 400 × 68? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  36. 36.Which is closest to 298 + 805 + 498? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  37. 37.Round 31.38 to one decimal place. =
  38. 38.Which is closest to 296 + 602 + 397? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  39. 39.Which is closest to 402 × 52? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  40. 40.Round 35077 to the nearest thousand.

Answer key

  1. 18000
  2. 2100
  3. 80
  4. 45000
  5. 36000
  6. 56000
  7. 1400
  8. 50
  9. 35000
  10. 21.6
  11. 10420
  12. 24000
  13. 1000
  14. 27000
  15. 10000
  16. 18.7
  17. 86120
  18. 1600
  19. 17.3
  20. 24.4
  21. 72000
  22. 50
  23. 14000
  24. 24.5
  25. 79.6
  26. 12000
  27. 26.2
  28. 73.4
  29. 1100
  30. 42000
  31. 35800
  32. 90
  33. 49.1
  34. 55.1
  35. 28000
  36. 1600
  37. 31.4
  38. 1300
  39. 20000
  40. 35000

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