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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 869 · 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 26706 to the nearest hundred.
  2. 2.Which is closest to 304 × 88? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  3. 3.Which is closest to 696 × 28? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  4. 4.Which is closest to 808 ÷ 39? (a) 10 (b) 40 (c) 200 (d) 20
  5. 5.Which is closest to 501 + 505 + 101? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  6. 6.Which is closest to 704 × 50? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  7. 7.Round 93052 to the nearest ten.
  8. 8.Round 40795 to the nearest hundred.
  9. 9.Which is closest to 799 × 41? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
  10. 10.Which is closest to 403 + 497 + 503? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  11. 11.Which is closest to 594 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  12. 12.Round 82.54 to one decimal place. =
  13. 13.Round 65168 to the nearest ten.
  14. 14.Which is closest to 1192 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  15. 15.Which is closest to 604 × 89? (Round each number first.) (a) 5400 (b) 54000 (c) 540000 (d) 108000
  16. 16.Which is closest to 898 × 58? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
  17. 17.Which is closest to 803 × 61? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  18. 18.Round 56903 to the nearest ten.
  19. 19.Which is closest to 601 × 39? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  20. 20.Which is closest to 1003 ÷ 19? (a) 25 (b) 500 (c) 50 (d) 100
  21. 21.Which is closest to 799 + 702 + 99? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  22. 22.Which is closest to 394 ÷ 21? (a) 10 (b) 20 (c) 200 (d) 40
  23. 23.Which is closest to 804 + 704 + 805? (a) 2500 (b) 2200 (c) 2300 (d) 2400
  24. 24.Round 25982 to the nearest ten.
  25. 25.Round 61.18 to one decimal place. =
  26. 26.Which is closest to 1805 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  27. 27.Round 37.53 to one decimal place. =
  28. 28.Round 62.24 to one decimal place. =
  29. 29.Round 37403 to the nearest ten.
  30. 30.Round 87349 to the nearest ten.
  31. 31.Which is closest to 204 × 30? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  32. 32.Which is closest to 205 + 799 + 803? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  33. 33.Which is closest to 402 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  34. 34.Which is closest to 99 + 195 + 202? (a) 600 (b) 700 (c) 400 (d) 500
  35. 35.Round 80.74 to one decimal place. =
  36. 36.Round 90.37 to one decimal place. =
  37. 37.Which is closest to 696 + 197 + 698? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  38. 38.Round 84257 to the nearest ten.
  39. 39.Which is closest to 302 × 42? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  40. 40.Round 69197 to the nearest thousand.

Answer key

  1. 26700
  2. 27000
  3. 21000
  4. 20
  5. 1100
  6. 35000
  7. 93050
  8. 40800
  9. 32000
  10. 1400
  11. 30
  12. 82.5
  13. 65170
  14. 60
  15. 54000
  16. 54000
  17. 48000
  18. 56900
  19. 24000
  20. 50
  21. 1600
  22. 20
  23. 2300
  24. 25980
  25. 61.2
  26. 60
  27. 37.5
  28. 62.2
  29. 37400
  30. 87350
  31. 6000
  32. 1800
  33. 20
  34. 500
  35. 80.7
  36. 90.4
  37. 1600
  38. 84260
  39. 12000
  40. 69000

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