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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 969 · 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 2100 ÷ 31? (a) 70 (b) 700 (c) 35 (d) 140
  2. 2.Round 85154 to the nearest hundred.
  3. 3.Round 45702 to the nearest thousand.
  4. 4.Round 43.07 to one decimal place. =
  5. 5.Round 12.68 to one decimal place. =
  6. 6.Which is closest to 897 + 202 + 295? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  7. 7.Which is closest to 295 + 596 + 800? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  8. 8.Which is closest to 599 × 61? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  9. 9.Round 9979 to the nearest hundred.
  10. 10.Which is closest to 302 × 92? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  11. 11.Which is closest to 398 × 42? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  12. 12.Round 28773 to the nearest thousand.
  13. 13.Which is closest to 896 + 95 + 596? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  14. 14.Which is closest to 700 + 97 + 297? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  15. 15.Which is closest to 297 × 21? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  16. 16.Which is closest to 103 + 796 + 499? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  17. 17.Round 45834 to the nearest thousand.
  18. 18.Round 99.49 to one decimal place. =
  19. 19.Which is closest to 197 × 92? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  20. 20.Round 33797 to the nearest ten.
  21. 21.Round 4711 to the nearest hundred.
  22. 22.Round 76.82 to one decimal place. =
  23. 23.Round 64790 to the nearest hundred.
  24. 24.Which is closest to 301 + 602 + 703? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  25. 25.Which is closest to 97 + 295 + 895? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  26. 26.Round 5235 to the nearest thousand.
  27. 27.Which is closest to 504 + 95 + 496? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  28. 28.Round 25.63 to one decimal place. =
  29. 29.Round 35.29 to one decimal place. =
  30. 30.Which is closest to 497 + 400 + 296? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  31. 31.Round 47097 to the nearest ten.
  32. 32.Which is closest to 806 ÷ 39? (a) 200 (b) 10 (c) 40 (d) 20
  33. 33.Round 40219 to the nearest ten.
  34. 34.Round 89.22 to one decimal place. =
  35. 35.Round 12.22 to one decimal place. =
  36. 36.Which is closest to 1494 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  37. 37.Which is closest to 497 + 302 + 600? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  38. 38.Round 95474 to the nearest thousand.
  39. 39.Round 74.68 to one decimal place. =
  40. 40.Which is closest to 398 + 897 + 101? (a) 1500 (b) 1600 (c) 1400 (d) 1300

Answer key

  1. 70
  2. 85200
  3. 46000
  4. 43.1
  5. 12.7
  6. 1400
  7. 1700
  8. 36000
  9. 10000
  10. 27000
  11. 16000
  12. 29000
  13. 1600
  14. 1100
  15. 6000
  16. 1400
  17. 46000
  18. 99.5
  19. 18000
  20. 33800
  21. 4700
  22. 76.8
  23. 64800
  24. 1600
  25. 1300
  26. 5000
  27. 1100
  28. 25.6
  29. 35.3
  30. 1200
  31. 47100
  32. 20
  33. 40220
  34. 89.2
  35. 12.2
  36. 50
  37. 1400
  38. 95000
  39. 74.7
  40. 1400

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