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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 502 · 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 202 × 79? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  2. 2.Which is closest to 505 + 198 + 104? (a) 700 (b) 800 (c) 1000 (d) 900
  3. 3.Round 1657 to the nearest ten.
  4. 4.Round 53093 to the nearest hundred.
  5. 5.Round 24.33 to one decimal place. =
  6. 6.Round 94.62 to one decimal place. =
  7. 7.Which is closest to 1794 ÷ 19? (a) 180 (b) 90 (c) 45 (d) 900
  8. 8.Which is closest to 99 + 97 + 199? (a) 600 (b) 300 (c) 500 (d) 400
  9. 9.Round 29033 to the nearest ten.
  10. 10.Round 86921 to the nearest thousand.
  11. 11.Which is closest to 297 × 80? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  12. 12.Which is closest to 3500 ÷ 51? (a) 140 (b) 35 (c) 70 (d) 700
  13. 13.Round 21.67 to one decimal place. =
  14. 14.Round 27088 to the nearest thousand.
  15. 15.Which is closest to 196 × 90? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  16. 16.Round 64.57 to one decimal place. =
  17. 17.Round 82311 to the nearest ten.
  18. 18.Which is closest to 301 × 40? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  19. 19.Round 72.39 to one decimal place. =
  20. 20.Round 10606 to the nearest hundred.
  21. 21.Round 48.36 to one decimal place. =
  22. 22.Round 11841 to the nearest thousand.
  23. 23.Round 48.42 to one decimal place. =
  24. 24.Round 47.74 to one decimal place. =
  25. 25.Which is closest to 399 + 196 + 696? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  26. 26.Which is closest to 499 + 704 + 905? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  27. 27.Round 67.68 to one decimal place. =
  28. 28.Which is closest to 599 + 897 + 505? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  29. 29.Which is closest to 903 + 398 + 503? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  30. 30.Which is closest to 2506 ÷ 49? (a) 25 (b) 50 (c) 100 (d) 500
  31. 31.Round 50.58 to one decimal place. =
  32. 32.Which is closest to 204 + 498 + 299? (a) 1000 (b) 1100 (c) 1200 (d) 900
  33. 33.Which is closest to 299 × 61? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  34. 34.Which is closest to 501 × 70? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  35. 35.Which is closest to 503 + 198 + 396? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  36. 36.Round 92.71 to one decimal place. =
  37. 37.Which is closest to 1592 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
  38. 38.Which is closest to 898 + 899 + 404? (a) 2200 (b) 2300 (c) 2400 (d) 2100
  39. 39.Which is closest to 601 × 49? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  40. 40.Which is closest to 203 × 20? (Round each number first.) (a) 8000 (b) 400 (c) 40000 (d) 4000

Answer key

  1. 16000
  2. 800
  3. 1660
  4. 53100
  5. 24.3
  6. 94.6
  7. 90
  8. 400
  9. 29030
  10. 87000
  11. 24000
  12. 70
  13. 21.7
  14. 27000
  15. 18000
  16. 64.6
  17. 82310
  18. 12000
  19. 72.4
  20. 10600
  21. 48.4
  22. 12000
  23. 48.4
  24. 47.7
  25. 1300
  26. 2100
  27. 67.7
  28. 2000
  29. 1800
  30. 50
  31. 50.6
  32. 1000
  33. 18000
  34. 35000
  35. 1100
  36. 92.7
  37. 80
  38. 2200
  39. 30000
  40. 4000

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