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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 781 · 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 500 + 503 + 801? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  2. 2.Which is closest to 505 + 398 + 895? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  3. 3.Which is closest to 204 + 403 + 802? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  4. 4.Round 45464 to the nearest hundred.
  5. 5.Which is closest to 503 × 19? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  6. 6.Which is closest to 99 + 595 + 801? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  7. 7.Round 8696 to the nearest hundred.
  8. 8.Round 55.33 to one decimal place. =
  9. 9.Which is closest to 1209 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  10. 10.Which is closest to 297 × 28? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  11. 11.Round 69.49 to one decimal place. =
  12. 12.Which is closest to 497 + 104 + 95? (a) 800 (b) 600 (c) 700 (d) 900
  13. 13.Round 72.24 to one decimal place. =
  14. 14.Round 82.54 to one decimal place. =
  15. 15.Which is closest to 297 × 49? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  16. 16.Round 72.64 to one decimal place. =
  17. 17.Which is closest to 1198 ÷ 39? (a) 60 (b) 15 (c) 300 (d) 30
  18. 18.Which is closest to 800 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  19. 19.Which is closest to 800 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  20. 20.Which is closest to 400 × 81? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  21. 21.Round 44196 to the nearest hundred.
  22. 22.Round 2025 to the nearest thousand.
  23. 23.Which is closest to 300 × 31? (Round each number first.) (a) 900 (b) 90000 (c) 18000 (d) 9000
  24. 24.Which is closest to 903 × 78? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  25. 25.Which is closest to 895 + 204 + 395? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  26. 26.Which is closest to 1208 ÷ 29? (a) 80 (b) 40 (c) 20 (d) 400
  27. 27.Round 47952 to the nearest hundred.
  28. 28.Round 28.36 to one decimal place. =
  29. 29.Which is closest to 3203 ÷ 39? (a) 800 (b) 160 (c) 40 (d) 80
  30. 30.Round 11.84 to one decimal place. =
  31. 31.Round 16605 to the nearest hundred.
  32. 32.Round 41.42 to one decimal place. =
  33. 33.Round 18187 to the nearest hundred.
  34. 34.Which is closest to 798 × 81? (Round each number first.) (a) 128000 (b) 640000 (c) 64000 (d) 6400
  35. 35.Which is closest to 1803 ÷ 19? (a) 45 (b) 90 (c) 180 (d) 900
  36. 36.Which is closest to 299 + 797 + 895? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  37. 37.Which is closest to 3500 ÷ 49? (a) 70 (b) 700 (c) 35 (d) 140
  38. 38.Which is closest to 902 + 795 + 895? (a) 2500 (b) 2600 (c) 2700 (d) 2800
  39. 39.Which is closest to 1192 ÷ 31? (a) 80 (b) 400 (c) 40 (d) 20
  40. 40.Which is closest to 501 + 702 + 703? (a) 2100 (b) 1800 (c) 1900 (d) 2000

Answer key

  1. 1800
  2. 1800
  3. 1400
  4. 45500
  5. 10000
  6. 1500
  7. 8700
  8. 55.3
  9. 30
  10. 9000
  11. 69.5
  12. 700
  13. 72.2
  14. 82.5
  15. 15000
  16. 72.6
  17. 30
  18. 40
  19. 24000
  20. 32000
  21. 44200
  22. 2000
  23. 9000
  24. 72000
  25. 1500
  26. 40
  27. 48000
  28. 28.4
  29. 80
  30. 11.8
  31. 16600
  32. 41.4
  33. 18200
  34. 64000
  35. 90
  36. 2000
  37. 70
  38. 2600
  39. 40
  40. 1900

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