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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 329 · 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 897 × 71? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  2. 2.Round 81182 to the nearest ten.
  3. 3.Round 45.49 to one decimal place. =
  4. 4.Which is closest to 904 + 802 + 198? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  5. 5.Round 23278 to the nearest hundred.
  6. 6.Which is closest to 797 ÷ 39? (a) 10 (b) 20 (c) 200 (d) 40
  7. 7.Which is closest to 900 × 59? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
  8. 8.Round 33258 to the nearest thousand.
  9. 9.Which is closest to 497 × 19? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  10. 10.Round 4571 to the nearest thousand.
  11. 11.Round 61676 to the nearest hundred.
  12. 12.Which is closest to 899 × 80? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  13. 13.Round 43417 to the nearest ten.
  14. 14.Which is closest to 701 × 18? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  15. 15.Which is closest to 2000 ÷ 41? (a) 50 (b) 100 (c) 500 (d) 25
  16. 16.Which is closest to 498 × 58? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  17. 17.Round 86903 to the nearest hundred.
  18. 18.Which is closest to 594 ÷ 29? (a) 40 (b) 10 (c) 20 (d) 200
  19. 19.Round 14.18 to one decimal place. =
  20. 20.Which is closest to 395 + 200 + 899? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  21. 21.Round 34278 to the nearest thousand.
  22. 22.Which is closest to 702 + 299 + 304? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  23. 23.Round 15.78 to one decimal place. =
  24. 24.Which is closest to 604 ÷ 19? (a) 30 (b) 300 (c) 60 (d) 15
  25. 25.Which is closest to 302 + 304 + 595? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  26. 26.Round 48.86 to one decimal place. =
  27. 27.Which is closest to 405 + 900 + 796? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  28. 28.Round 22180 to the nearest hundred.
  29. 29.Which is closest to 792 ÷ 19? (a) 400 (b) 40 (c) 80 (d) 20
  30. 30.Round 1536 to the nearest ten.
  31. 31.Which is closest to 298 × 28? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  32. 32.Which is closest to 2003 ÷ 49? (a) 20 (b) 400 (c) 80 (d) 40
  33. 33.Round 74444 to the nearest hundred.
  34. 34.Round 12.86 to one decimal place. =
  35. 35.Which is closest to 700 × 22? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  36. 36.Which is closest to 1209 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600
  37. 37.Round 80371 to the nearest hundred.
  38. 38.Which is closest to 608 ÷ 31? (a) 40 (b) 10 (c) 200 (d) 20
  39. 39.Which is closest to 1000 ÷ 21? (a) 100 (b) 500 (c) 50 (d) 25
  40. 40.Which is closest to 704 + 104 + 204? (a) 1200 (b) 900 (c) 1100 (d) 1000

Answer key

  1. 63000
  2. 81180
  3. 45.5
  4. 1900
  5. 23300
  6. 20
  7. 54000
  8. 33000
  9. 10000
  10. 5000
  11. 61700
  12. 72000
  13. 43420
  14. 14000
  15. 50
  16. 30000
  17. 86900
  18. 20
  19. 14.2
  20. 1500
  21. 34000
  22. 1300
  23. 15.8
  24. 30
  25. 1200
  26. 48.9
  27. 2100
  28. 22200
  29. 40
  30. 1540
  31. 9000
  32. 40
  33. 74400
  34. 12.9
  35. 14000
  36. 60
  37. 80400
  38. 20
  39. 50
  40. 1000

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