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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 982 · 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 302 × 20? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  2. 2.Which is closest to 201 × 89? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  3. 3.Which is closest to 395 + 896 + 905? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  4. 4.Which is closest to 98 + 697 + 200? (a) 900 (b) 1100 (c) 1200 (d) 1000
  5. 5.Which is closest to 903 × 18? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  6. 6.Which is closest to 597 + 697 + 798? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  7. 7.Round 85039 to the nearest ten.
  8. 8.Round 98.54 to one decimal place. =
  9. 9.Which is closest to 297 × 38? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  10. 10.Which is closest to 203 × 29? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  11. 11.Round 16427 to the nearest thousand.
  12. 12.Which is closest to 807 ÷ 41? (a) 200 (b) 40 (c) 10 (d) 20
  13. 13.Round 89963 to the nearest ten.
  14. 14.Which is closest to 596 × 59? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  15. 15.Round 38332 to the nearest thousand.
  16. 16.Which is closest to 601 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  17. 17.Round 62303 to the nearest ten.
  18. 18.Which is closest to 197 × 49? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  19. 19.Which is closest to 3005 ÷ 51? (a) 60 (b) 600 (c) 120 (d) 30
  20. 20.Round 71792 to the nearest ten.
  21. 21.Which is closest to 204 + 200 + 201? (a) 700 (b) 800 (c) 500 (d) 600
  22. 22.Which is closest to 1795 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600
  23. 23.Which is closest to 897 + 505 + 398? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  24. 24.Round 45.22 to one decimal place. =
  25. 25.Round 92.88 to one decimal place. =
  26. 26.Round 39.54 to one decimal place. =
  27. 27.Which is closest to 896 + 197 + 800? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  28. 28.Round 47.43 to one decimal place. =
  29. 29.Round 96.69 to one decimal place. =
  30. 30.Which is closest to 701 × 79? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
  31. 31.Which is closest to 703 × 69? (Round each number first.) (a) 4900 (b) 49000 (c) 98000 (d) 490000
  32. 32.Which is closest to 2391 ÷ 41? (a) 600 (b) 120 (c) 30 (d) 60
  33. 33.Round 42.72 to one decimal place. =
  34. 34.Which is closest to 396 + 795 + 500? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  35. 35.Which is closest to 399 × 38? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  36. 36.Round 49375 to the nearest thousand.
  37. 37.Which is closest to 1194 ÷ 41? (a) 30 (b) 60 (c) 15 (d) 300
  38. 38.Round 53.81 to one decimal place. =
  39. 39.Which is closest to 500 + 701 + 903? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  40. 40.Which is closest to 1504 ÷ 49? (a) 60 (b) 300 (c) 30 (d) 15

Answer key

  1. 6000
  2. 18000
  3. 2200
  4. 1000
  5. 18000
  6. 2100
  7. 85040
  8. 98.5
  9. 12000
  10. 6000
  11. 16000
  12. 20
  13. 89960
  14. 36000
  15. 38000
  16. 20
  17. 62300
  18. 10000
  19. 60
  20. 71790
  21. 600
  22. 60
  23. 1800
  24. 45.2
  25. 92.9
  26. 39.5
  27. 1900
  28. 47.4
  29. 96.7
  30. 56000
  31. 49000
  32. 60
  33. 42.7
  34. 1700
  35. 16000
  36. 49000
  37. 30
  38. 53.8
  39. 2100
  40. 30

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