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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 19 · 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 397 × 72? (Round each number first.) (a) 28000 (b) 56000 (c) 280000 (d) 2800
  2. 2.Which is closest to 201 × 22? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  3. 3.Round 8161 to the nearest hundred.
  4. 4.Which is closest to 597 × 62? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  5. 5.Which is closest to 503 × 68? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  6. 6.Which is closest to 1994 ÷ 51? (a) 20 (b) 400 (c) 40 (d) 80
  7. 7.Which is closest to 904 + 595 + 400? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  8. 8.Which is closest to 202 + 497 + 802? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  9. 9.Which is closest to 897 × 42? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  10. 10.Which is closest to 300 × 19? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  11. 11.Which is closest to 2809 ÷ 41? (a) 35 (b) 70 (c) 140 (d) 700
  12. 12.Which is closest to 904 + 396 + 397? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  13. 13.Which is closest to 198 × 72? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  14. 14.Round 94746 to the nearest ten.
  15. 15.Round 69946 to the nearest thousand.
  16. 16.Which is closest to 797 + 804 + 799? (a) 2500 (b) 2400 (c) 2600 (d) 2300
  17. 17.Which is closest to 98 + 800 + 395? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  18. 18.Which is closest to 4504 ÷ 51? (a) 900 (b) 45 (c) 90 (d) 180
  19. 19.Which is closest to 905 ÷ 29? (a) 15 (b) 300 (c) 30 (d) 60
  20. 20.Round 61718 to the nearest ten.
  21. 21.Round 37.58 to one decimal place. =
  22. 22.Round 37.49 to one decimal place. =
  23. 23.Round 86144 to the nearest thousand.
  24. 24.Which is closest to 1995 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  25. 25.Which is closest to 601 × 28? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  26. 26.Which is closest to 2402 ÷ 41? (a) 600 (b) 60 (c) 120 (d) 30
  27. 27.Round 30732 to the nearest ten.
  28. 28.Round 86518 to the nearest thousand.
  29. 29.Which is closest to 798 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  30. 30.Round 8761 to the nearest thousand.
  31. 31.Round 78.36 to one decimal place. =
  32. 32.Which is closest to 796 × 62? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  33. 33.Which is closest to 1993 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  34. 34.Round 90.81 to one decimal place. =
  35. 35.Which is closest to 904 + 300 + 899? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  36. 36.Which is closest to 904 + 203 + 802? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  37. 37.Round 14.19 to one decimal place. =
  38. 38.Which is closest to 203 × 58? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  39. 39.Round 18137 to the nearest ten.
  40. 40.Which is closest to 204 + 398 + 895? (a) 1700 (b) 1500 (c) 1400 (d) 1600

Answer key

  1. 28000
  2. 4000
  3. 8200
  4. 36000
  5. 35000
  6. 40
  7. 1900
  8. 1500
  9. 36000
  10. 6000
  11. 70
  12. 1700
  13. 14000
  14. 94750
  15. 70000
  16. 2400
  17. 1300
  18. 90
  19. 30
  20. 61720
  21. 37.6
  22. 37.5
  23. 86000
  24. 50
  25. 18000
  26. 60
  27. 30730
  28. 87000
  29. 24000
  30. 9000
  31. 78.4
  32. 48000
  33. 50
  34. 90.8
  35. 2100
  36. 1900
  37. 14.2
  38. 12000
  39. 18140
  40. 1500

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