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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 613 · 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 21.44 to one decimal place. =
  2. 2.Round 36.31 to one decimal place. =
  3. 3.Round 91417 to the nearest thousand.
  4. 4.Round 56651 to the nearest ten.
  5. 5.Round 72.13 to one decimal place. =
  6. 6.Which is closest to 899 + 700 + 600? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  7. 7.Round 67317 to the nearest ten.
  8. 8.Which is closest to 102 + 305 + 95? (a) 500 (b) 700 (c) 600 (d) 400
  9. 9.Which is closest to 802 × 39? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  10. 10.Which is closest to 396 × 18? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  11. 11.Which is closest to 3607 ÷ 41? (a) 90 (b) 45 (c) 180 (d) 900
  12. 12.Round 95369 to the nearest hundred.
  13. 13.Round 56.87 to one decimal place. =
  14. 14.Round 45222 to the nearest ten.
  15. 15.Which is closest to 797 + 98 + 897? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  16. 16.Round 83.41 to one decimal place. =
  17. 17.Which is closest to 399 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  18. 18.Round 28643 to the nearest hundred.
  19. 19.Which is closest to 1808 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  20. 20.Which is closest to 504 + 505 + 497? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  21. 21.Round 66134 to the nearest hundred.
  22. 22.Which is closest to 3992 ÷ 49? (a) 40 (b) 800 (c) 80 (d) 160
  23. 23.Which is closest to 299 × 38? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  24. 24.Which is closest to 300 × 48? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  25. 25.Which is closest to 2002 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  26. 26.Which is closest to 105 + 405 + 599? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  27. 27.Round 90.18 to one decimal place. =
  28. 28.Which is closest to 404 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  29. 29.Round 43.73 to one decimal place. =
  30. 30.Which is closest to 4499 ÷ 51? (a) 45 (b) 900 (c) 90 (d) 180
  31. 31.Which is closest to 304 + 201 + 404? (a) 800 (b) 1100 (c) 900 (d) 1000
  32. 32.Which is closest to 697 + 303 + 100? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  33. 33.Round 44328 to the nearest hundred.
  34. 34.Round 4986 to the nearest thousand.
  35. 35.Which is closest to 497 + 301 + 204? (a) 900 (b) 1200 (c) 1000 (d) 1100
  36. 36.Round 81530 to the nearest hundred.
  37. 37.Which is closest to 499 × 21? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  38. 38.Which is closest to 400 ÷ 19? (a) 200 (b) 40 (c) 20 (d) 10
  39. 39.Round 18698 to the nearest hundred.
  40. 40.Which is closest to 800 + 696 + 501? (a) 2200 (b) 2000 (c) 1900 (d) 2100

Answer key

  1. 21.4
  2. 36.3
  3. 91000
  4. 56650
  5. 72.1
  6. 2200
  7. 67320
  8. 500
  9. 32000
  10. 8000
  11. 90
  12. 95400
  13. 56.9
  14. 45220
  15. 1800
  16. 83.4
  17. 12000
  18. 28600
  19. 90
  20. 1500
  21. 66100
  22. 80
  23. 12000
  24. 15000
  25. 50
  26. 1100
  27. 90.2
  28. 20
  29. 43.7
  30. 90
  31. 900
  32. 1100
  33. 44300
  34. 5000
  35. 1000
  36. 81500
  37. 10000
  38. 20
  39. 18700
  40. 2000

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