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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 371 · 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 99 + 304 + 400? (a) 800 (b) 900 (c) 700 (d) 1000
  2. 2.Round 28608 to the nearest hundred.
  3. 3.Which is closest to 895 + 796 + 598? (a) 2300 (b) 2500 (c) 2200 (d) 2400
  4. 4.Which is closest to 2095 ÷ 29? (a) 35 (b) 70 (c) 700 (d) 140
  5. 5.Round 99.47 to one decimal place. =
  6. 6.Round 66596 to the nearest hundred.
  7. 7.Round 8449 to the nearest ten.
  8. 8.Which is closest to 403 × 58? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  9. 9.Round 54375 to the nearest hundred.
  10. 10.Round 58.87 to one decimal place. =
  11. 11.Which is closest to 201 + 399 + 199? (a) 800 (b) 900 (c) 700 (d) 1000
  12. 12.Round 25.78 to one decimal place. =
  13. 13.Which is closest to 302 × 49? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  14. 14.Which is closest to 4508 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  15. 15.Which is closest to 200 + 399 + 704? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  16. 16.Which is closest to 1797 ÷ 21? (a) 180 (b) 45 (c) 90 (d) 900
  17. 17.Which is closest to 902 + 499 + 499? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  18. 18.Which is closest to 598 + 695 + 802? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  19. 19.Round 17.42 to one decimal place. =
  20. 20.Which is closest to 202 × 69? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  21. 21.Which is closest to 605 + 305 + 698? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  22. 22.Which is closest to 496 × 62? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  23. 23.Round 92.43 to one decimal place. =
  24. 24.Round 29879 to the nearest ten.
  25. 25.Which is closest to 3600 ÷ 39? (a) 45 (b) 900 (c) 90 (d) 180
  26. 26.Which is closest to 595 + 305 + 95? (a) 900 (b) 1200 (c) 1100 (d) 1000
  27. 27.Round 97.56 to one decimal place. =
  28. 28.Which is closest to 400 × 31? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  29. 29.Which is closest to 1202 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  30. 30.Which is closest to 2706 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  31. 31.Round 45.63 to one decimal place. =
  32. 32.Which is closest to 301 × 79? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  33. 33.Which is closest to 404 × 60? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  34. 34.Round 69908 to the nearest ten.
  35. 35.Round 81504 to the nearest hundred.
  36. 36.Round 67.24 to one decimal place. =
  37. 37.Which is closest to 803 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
  38. 38.Which is closest to 802 + 302 + 697? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  39. 39.Round 74803 to the nearest ten.
  40. 40.Which is closest to 201 × 28? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000

Answer key

  1. 800
  2. 28600
  3. 2300
  4. 70
  5. 99.5
  6. 66600
  7. 8450
  8. 24000
  9. 54400
  10. 58.9
  11. 800
  12. 25.8
  13. 15000
  14. 90
  15. 1300
  16. 90
  17. 1900
  18. 2100
  19. 17.4
  20. 14000
  21. 1600
  22. 30000
  23. 92.4
  24. 29880
  25. 90
  26. 1000
  27. 97.6
  28. 12000
  29. 30
  30. 90
  31. 45.6
  32. 24000
  33. 24000
  34. 69910
  35. 81500
  36. 67.2
  37. 40
  38. 1800
  39. 74800
  40. 6000

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