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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 438 · 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 17.18 to one decimal place. =
  2. 2.Round 53.18 to one decimal place. =
  3. 3.Which is closest to 201 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  4. 4.Round 7716 to the nearest thousand.
  5. 5.Which is closest to 1202 ÷ 29? (a) 80 (b) 400 (c) 20 (d) 40
  6. 6.Round 93901 to the nearest thousand.
  7. 7.Round 91.89 to one decimal place. =
  8. 8.Round 64651 to the nearest ten.
  9. 9.Which is closest to 299 + 403 + 395? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  10. 10.Round 39.26 to one decimal place. =
  11. 11.Which is closest to 704 + 495 + 499? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  12. 12.Which is closest to 497 + 404 + 198? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  13. 13.Which is closest to 702 × 82? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  14. 14.Round 15.64 to one decimal place. =
  15. 15.Which is closest to 696 + 103 + 101? (a) 900 (b) 1000 (c) 1100 (d) 800
  16. 16.Round 45.52 to one decimal place. =
  17. 17.Round 56639 to the nearest ten.
  18. 18.Which is closest to 600 ÷ 29? (a) 10 (b) 20 (c) 40 (d) 200
  19. 19.Which is closest to 797 × 48? (Round each number first.) (a) 40000 (b) 80000 (c) 4000 (d) 400000
  20. 20.Round 10353 to the nearest hundred.
  21. 21.Round 22573 to the nearest ten.
  22. 22.Round 54876 to the nearest ten.
  23. 23.Round 96.33 to one decimal place. =
  24. 24.Which is closest to 603 × 61? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  25. 25.Which is closest to 499 × 72? (Round each number first.) (a) 35000 (b) 70000 (c) 3500 (d) 350000
  26. 26.Round 20.37 to one decimal place. =
  27. 27.Which is closest to 799 ÷ 41? (a) 40 (b) 200 (c) 20 (d) 10
  28. 28.Round 98.73 to one decimal place. =
  29. 29.Which is closest to 2003 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  30. 30.Which is closest to 197 + 598 + 295? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  31. 31.Which is closest to 97 + 698 + 401? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  32. 32.Round 8938 to the nearest hundred.
  33. 33.Which is closest to 1800 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  34. 34.Which is closest to 95 + 103 + 295? (a) 600 (b) 500 (c) 400 (d) 700
  35. 35.Which is closest to 3004 ÷ 51? (a) 30 (b) 60 (c) 600 (d) 120
  36. 36.Which is closest to 1991 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
  37. 37.Round 51110 to the nearest thousand.
  38. 38.Round 52.79 to one decimal place. =
  39. 39.Round 27.44 to one decimal place. =
  40. 40.Which is closest to 1194 ÷ 19? (a) 120 (b) 30 (c) 600 (d) 60

Answer key

  1. 17.2
  2. 53.2
  3. 12000
  4. 8000
  5. 40
  6. 94000
  7. 91.9
  8. 64650
  9. 1100
  10. 39.3
  11. 1700
  12. 1100
  13. 56000
  14. 15.6
  15. 900
  16. 45.5
  17. 56640
  18. 20
  19. 40000
  20. 10400
  21. 22570
  22. 54880
  23. 96.3
  24. 36000
  25. 35000
  26. 20.4
  27. 20
  28. 98.7
  29. 50
  30. 1100
  31. 1200
  32. 8900
  33. 90
  34. 500
  35. 60
  36. 40
  37. 51000
  38. 52.8
  39. 27.4
  40. 60

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