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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 309 · 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 898 + 696 + 596? (a) 2200 (b) 2100 (c) 2400 (d) 2300
  2. 2.Round 74.66 to one decimal place. =
  3. 3.Round 65.86 to one decimal place. =
  4. 4.Round 16517 to the nearest hundred.
  5. 5.Round 51.07 to one decimal place. =
  6. 6.Which is closest to 898 × 80? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  7. 7.Round 24.13 to one decimal place. =
  8. 8.Which is closest to 699 × 52? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  9. 9.Round 14439 to the nearest thousand.
  10. 10.Round 40.64 to one decimal place. =
  11. 11.Which is closest to 1808 ÷ 29? (a) 60 (b) 600 (c) 30 (d) 120
  12. 12.Round 91.54 to one decimal place. =
  13. 13.Which is closest to 201 + 702 + 196? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  14. 14.Which is closest to 807 ÷ 19? (a) 40 (b) 80 (c) 400 (d) 20
  15. 15.Round 50447 to the nearest hundred.
  16. 16.Round 43.68 to one decimal place. =
  17. 17.Which is closest to 598 + 300 + 495? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  18. 18.Which is closest to 704 × 42? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
  19. 19.Which is closest to 604 ÷ 31? (a) 20 (b) 40 (c) 200 (d) 10
  20. 20.Which is closest to 3008 ÷ 51? (a) 30 (b) 120 (c) 60 (d) 600
  21. 21.Which is closest to 3003 ÷ 51? (a) 120 (b) 60 (c) 600 (d) 30
  22. 22.Which is closest to 299 × 29? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  23. 23.Which is closest to 1502 ÷ 51? (a) 300 (b) 15 (c) 60 (d) 30
  24. 24.Round 92.87 to one decimal place. =
  25. 25.Round 53.83 to one decimal place. =
  26. 26.Which is closest to 304 + 195 + 302? (a) 900 (b) 800 (c) 700 (d) 1000
  27. 27.Round 33365 to the nearest thousand.
  28. 28.Which is closest to 2506 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  29. 29.Which is closest to 602 × 90? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  30. 30.Which is closest to 798 × 71? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  31. 31.Which is closest to 1193 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  32. 32.Round 36.66 to one decimal place. =
  33. 33.Round 91.63 to one decimal place. =
  34. 34.Round 70890 to the nearest hundred.
  35. 35.Which is closest to 400 + 799 + 903? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  36. 36.Which is closest to 197 × 78? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  37. 37.Which is closest to 1508 ÷ 51? (a) 300 (b) 60 (c) 30 (d) 15
  38. 38.Which is closest to 401 × 18? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  39. 39.Round 19.39 to one decimal place. =
  40. 40.Which is closest to 195 + 496 + 297? (a) 1200 (b) 900 (c) 1000 (d) 1100

Answer key

  1. 2200
  2. 74.7
  3. 65.9
  4. 16500
  5. 51.1
  6. 72000
  7. 24.1
  8. 35000
  9. 14000
  10. 40.6
  11. 60
  12. 91.5
  13. 1100
  14. 40
  15. 50400
  16. 43.7
  17. 1400
  18. 28000
  19. 20
  20. 60
  21. 60
  22. 9000
  23. 30
  24. 92.9
  25. 53.8
  26. 800
  27. 33000
  28. 50
  29. 54000
  30. 56000
  31. 60
  32. 36.7
  33. 91.6
  34. 70900
  35. 2100
  36. 16000
  37. 30
  38. 8000
  39. 19.4
  40. 1000

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