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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 611 · 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 19.38 to one decimal place. =
  2. 2.Round 70462 to the nearest ten.
  3. 3.Which is closest to 603 × 91? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  4. 4.Which is closest to 97 + 301 + 196? (a) 500 (b) 600 (c) 700 (d) 800
  5. 5.Round 15.82 to one decimal place. =
  6. 6.Round 13.18 to one decimal place. =
  7. 7.Which is closest to 803 ÷ 41? (a) 10 (b) 20 (c) 40 (d) 200
  8. 8.Which is closest to 404 + 796 + 100? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  9. 9.Round 41384 to the nearest thousand.
  10. 10.Round 32418 to the nearest hundred.
  11. 11.Round 17.49 to one decimal place. =
  12. 12.Which is closest to 296 × 78? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  13. 13.Round 39302 to the nearest thousand.
  14. 14.Which is closest to 502 + 505 + 601? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  15. 15.Which is closest to 397 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  16. 16.Round 52.29 to one decimal place. =
  17. 17.Which is closest to 704 + 203 + 300? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  18. 18.Which is closest to 3609 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  19. 19.Which is closest to 2504 ÷ 49? (a) 500 (b) 100 (c) 25 (d) 50
  20. 20.Which is closest to 696 + 105 + 96? (a) 900 (b) 1000 (c) 800 (d) 1100
  21. 21.Which is closest to 100 + 402 + 295? (a) 900 (b) 1000 (c) 800 (d) 700
  22. 22.Round 28328 to the nearest thousand.
  23. 23.Which is closest to 95 + 100 + 495? (a) 600 (b) 800 (c) 700 (d) 900
  24. 24.Which is closest to 203 + 204 + 902? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  25. 25.Round 50479 to the nearest hundred.
  26. 26.Round 92488 to the nearest ten.
  27. 27.Round 96.89 to one decimal place. =
  28. 28.Round 33765 to the nearest hundred.
  29. 29.Round 16.21 to one decimal place. =
  30. 30.Round 26.38 to one decimal place. =
  31. 31.Which is closest to 298 + 602 + 798? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  32. 32.Round 15349 to the nearest hundred.
  33. 33.Which is closest to 894 ÷ 29? (a) 15 (b) 300 (c) 30 (d) 60
  34. 34.Which is closest to 992 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25
  35. 35.Which is closest to 900 × 31? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  36. 36.Round 26438 to the nearest ten.
  37. 37.Which is closest to 799 × 61? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  38. 38.Round 57.29 to one decimal place. =
  39. 39.Round 22.21 to one decimal place. =
  40. 40.Which is closest to 302 + 802 + 395? (a) 1600 (b) 1500 (c) 1400 (d) 1700

Answer key

  1. 19.4
  2. 70460
  3. 54000
  4. 600
  5. 15.8
  6. 13.2
  7. 20
  8. 1300
  9. 41000
  10. 32400
  11. 17.5
  12. 24000
  13. 39000
  14. 1600
  15. 12000
  16. 52.3
  17. 1200
  18. 90
  19. 50
  20. 900
  21. 800
  22. 28000
  23. 700
  24. 1300
  25. 50500
  26. 92490
  27. 96.9
  28. 33800
  29. 16.2
  30. 26.4
  31. 1700
  32. 15300
  33. 30
  34. 50
  35. 27000
  36. 26440
  37. 48000
  38. 57.3
  39. 22.2
  40. 1500

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