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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 340 · 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 1501 ÷ 51? (a) 30 (b) 300 (c) 60 (d) 15
  2. 2.Round 74993 to the nearest thousand.
  3. 3.Which is closest to 1791 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  4. 4.Round 89.62 to one decimal place. =
  5. 5.Which is closest to 900 × 61? (Round each number first.) (a) 108000 (b) 54000 (c) 540000 (d) 5400
  6. 6.Round 98.93 to one decimal place. =
  7. 7.Which is closest to 200 + 203 + 97? (a) 500 (b) 700 (c) 600 (d) 400
  8. 8.Which is closest to 301 × 32? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  9. 9.Which is closest to 397 + 696 + 697? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  10. 10.Round 40.57 to one decimal place. =
  11. 11.Which is closest to 497 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  12. 12.Which is closest to 809 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  13. 13.Which is closest to 600 + 95 + 395? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  14. 14.Which is closest to 803 + 801 + 99? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  15. 15.Which is closest to 609 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  16. 16.Which is closest to 1993 ÷ 51? (a) 400 (b) 40 (c) 20 (d) 80
  17. 17.Round 15.51 to one decimal place. =
  18. 18.Which is closest to 401 × 20? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  19. 19.Which is closest to 896 × 40? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  20. 20.Which is closest to 204 × 49? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  21. 21.Which is closest to 103 + 98 + 97? (a) 200 (b) 500 (c) 400 (d) 300
  22. 22.Which is closest to 198 + 204 + 798? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  23. 23.Round 30589 to the nearest thousand.
  24. 24.Which is closest to 796 + 395 + 598? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  25. 25.Which is closest to 1191 ÷ 21? (a) 120 (b) 600 (c) 30 (d) 60
  26. 26.Which is closest to 701 + 397 + 202? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  27. 27.Which is closest to 702 + 601 + 95? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  28. 28.Round 53.34 to one decimal place. =
  29. 29.Which is closest to 896 ÷ 29? (a) 60 (b) 300 (c) 30 (d) 15
  30. 30.Which is closest to 200 + 899 + 105? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  31. 31.Which is closest to 601 + 897 + 399? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  32. 32.Which is closest to 904 + 799 + 595? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  33. 33.Round 84999 to the nearest thousand.
  34. 34.Which is closest to 399 + 198 + 396? (a) 900 (b) 1200 (c) 1000 (d) 1100
  35. 35.Which is closest to 297 + 97 + 300? (a) 900 (b) 700 (c) 800 (d) 600
  36. 36.Round 79088 to the nearest ten.
  37. 37.Which is closest to 204 × 51? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  38. 38.Round 59114 to the nearest hundred.
  39. 39.Round 31.07 to one decimal place. =
  40. 40.Round 85713 to the nearest hundred.

Answer key

  1. 30
  2. 75000
  3. 60
  4. 89.6
  5. 54000
  6. 98.9
  7. 500
  8. 9000
  9. 1800
  10. 40.6
  11. 15000
  12. 20
  13. 1100
  14. 1700
  15. 30
  16. 40
  17. 15.5
  18. 8000
  19. 36000
  20. 10000
  21. 300
  22. 1200
  23. 31000
  24. 1800
  25. 60
  26. 1300
  27. 1400
  28. 53.3
  29. 30
  30. 1200
  31. 1900
  32. 2300
  33. 85000
  34. 1000
  35. 700
  36. 79090
  37. 10000
  38. 59100
  39. 31.1
  40. 85700

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