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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 134 · 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 204 + 99 + 399? (a) 600 (b) 900 (c) 800 (d) 700
  2. 2.Round 96387 to the nearest hundred.
  3. 3.Round 14.84 to one decimal place. =
  4. 4.Which is closest to 205 + 496 + 797? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  5. 5.Which is closest to 500 × 22? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  6. 6.Round 3733 to the nearest hundred.
  7. 7.Round 71.93 to one decimal place. =
  8. 8.Which is closest to 197 × 50? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  9. 9.Which is closest to 1003 ÷ 21? (a) 100 (b) 50 (c) 500 (d) 25
  10. 10.Which is closest to 896 × 50? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  11. 11.Round 18.54 to one decimal place. =
  12. 12.Which is closest to 1006 ÷ 19? (a) 50 (b) 25 (c) 500 (d) 100
  13. 13.Which is closest to 197 × 52? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  14. 14.Round 29.88 to one decimal place. =
  15. 15.Which is closest to 2508 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  16. 16.Which is closest to 1397 ÷ 19? (a) 700 (b) 140 (c) 70 (d) 35
  17. 17.Round 26269 to the nearest hundred.
  18. 18.Which is closest to 392 ÷ 19? (a) 200 (b) 10 (c) 40 (d) 20
  19. 19.Round 95856 to the nearest hundred.
  20. 20.Which is closest to 602 × 51? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  21. 21.Round 75.78 to one decimal place. =
  22. 22.Round 23.19 to one decimal place. =
  23. 23.Which is closest to 407 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  24. 24.Which is closest to 302 + 197 + 800? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  25. 25.Round 51527 to the nearest hundred.
  26. 26.Round 27.23 to one decimal place. =
  27. 27.Which is closest to 1995 ÷ 39? (a) 500 (b) 100 (c) 50 (d) 25
  28. 28.Round 3790 to the nearest hundred.
  29. 29.Which is closest to 1509 ÷ 49? (a) 30 (b) 300 (c) 60 (d) 15
  30. 30.Which is closest to 397 + 303 + 602? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  31. 31.Round 55.26 to one decimal place. =
  32. 32.Which is closest to 297 + 401 + 395? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  33. 33.Round 50.68 to one decimal place. =
  34. 34.Which is closest to 2709 ÷ 29? (a) 90 (b) 900 (c) 180 (d) 45
  35. 35.Which is closest to 2004 ÷ 39? (a) 50 (b) 25 (c) 500 (d) 100
  36. 36.Which is closest to 2492 ÷ 49? (a) 25 (b) 500 (c) 100 (d) 50
  37. 37.Which is closest to 301 + 703 + 95? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  38. 38.Which is closest to 101 + 796 + 205? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  39. 39.Which is closest to 699 + 805 + 500? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  40. 40.Which is closest to 1796 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60

Answer key

  1. 700
  2. 96400
  3. 14.8
  4. 1500
  5. 10000
  6. 3700
  7. 71.9
  8. 10000
  9. 50
  10. 45000
  11. 18.5
  12. 50
  13. 10000
  14. 29.9
  15. 50
  16. 70
  17. 26300
  18. 20
  19. 95900
  20. 30000
  21. 75.8
  22. 23.2
  23. 20
  24. 1300
  25. 51500
  26. 27.2
  27. 50
  28. 3800
  29. 30
  30. 1300
  31. 55.3
  32. 1100
  33. 50.7
  34. 90
  35. 50
  36. 50
  37. 1100
  38. 1100
  39. 2000
  40. 60

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