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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 184 · 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 698 × 38? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  2. 2.Which is closest to 497 + 299 + 97? (a) 1100 (b) 1000 (c) 900 (d) 800
  3. 3.Which is closest to 200 + 895 + 102? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  4. 4.Round 13.37 to one decimal place. =
  5. 5.Round 26110 to the nearest thousand.
  6. 6.Which is closest to 802 × 60? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  7. 7.Which is closest to 803 × 52? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  8. 8.Which is closest to 505 + 705 + 105? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  9. 9.Which is closest to 798 + 599 + 399? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  10. 10.Which is closest to 204 × 21? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  11. 11.Round 71.81 to one decimal place. =
  12. 12.Round 13281 to the nearest hundred.
  13. 13.Round 64489 to the nearest ten.
  14. 14.Which is closest to 402 × 71? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  15. 15.Round 42618 to the nearest ten.
  16. 16.Which is closest to 304 + 798 + 695? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  17. 17.Which is closest to 797 + 396 + 102? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  18. 18.Which is closest to 300 × 88? (Round each number first.) (a) 27000 (b) 270000 (c) 2700 (d) 54000
  19. 19.Round 25263 to the nearest hundred.
  20. 20.Which is closest to 404 × 71? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  21. 21.Which is closest to 203 × 19? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  22. 22.Which is closest to 1799 ÷ 21? (a) 90 (b) 180 (c) 900 (d) 45
  23. 23.Which is closest to 1006 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  24. 24.Round 94.83 to one decimal place. =
  25. 25.Which is closest to 597 ÷ 19? (a) 60 (b) 30 (c) 15 (d) 300
  26. 26.Round 43486 to the nearest ten.
  27. 27.Which is closest to 101 + 202 + 897? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  28. 28.Which is closest to 2400 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  29. 29.Round 39.89 to one decimal place. =
  30. 30.Round 94.77 to one decimal place. =
  31. 31.Round 86242 to the nearest ten.
  32. 32.Which is closest to 401 + 195 + 598? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  33. 33.Which is closest to 503 × 19? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000
  34. 34.Round 26.17 to one decimal place. =
  35. 35.Which is closest to 298 + 705 + 402? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  36. 36.Round 75.67 to one decimal place. =
  37. 37.Round 13438 to the nearest hundred.
  38. 38.Which is closest to 203 × 51? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  39. 39.Which is closest to 2003 ÷ 49? (a) 40 (b) 80 (c) 400 (d) 20
  40. 40.Which is closest to 1809 ÷ 21? (a) 180 (b) 900 (c) 45 (d) 90

Answer key

  1. 28000
  2. 900
  3. 1200
  4. 13.4
  5. 26000
  6. 48000
  7. 40000
  8. 1300
  9. 1800
  10. 4000
  11. 71.8
  12. 13300
  13. 64490
  14. 28000
  15. 42620
  16. 1800
  17. 1300
  18. 27000
  19. 25300
  20. 28000
  21. 4000
  22. 90
  23. 20
  24. 94.8
  25. 30
  26. 43490
  27. 1200
  28. 60
  29. 39.9
  30. 94.8
  31. 86240
  32. 1200
  33. 10000
  34. 26.2
  35. 1400
  36. 75.7
  37. 13400
  38. 10000
  39. 40
  40. 90

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