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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 291 · 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 801 + 703 + 104? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  2. 2.Round 55.22 to one decimal place. =
  3. 3.Which is closest to 2809 ÷ 41? (a) 35 (b) 70 (c) 700 (d) 140
  4. 4.Round 38.58 to one decimal place. =
  5. 5.Which is closest to 805 ÷ 21? (a) 40 (b) 400 (c) 80 (d) 20
  6. 6.Round 5043 to the nearest thousand.
  7. 7.Round 28.69 to one decimal place. =
  8. 8.Round 89207 to the nearest hundred.
  9. 9.Which is closest to 97 + 102 + 102? (a) 300 (b) 400 (c) 200 (d) 500
  10. 10.Round 41.67 to one decimal place. =
  11. 11.Which is closest to 797 × 20? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  12. 12.Round 10.81 to one decimal place. =
  13. 13.Which is closest to 498 × 21? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  14. 14.Round 14581 to the nearest thousand.
  15. 15.Which is closest to 1193 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  16. 16.Which is closest to 3608 ÷ 39? (a) 180 (b) 900 (c) 90 (d) 45
  17. 17.Round 44.32 to one decimal place. =
  18. 18.Round 38936 to the nearest ten.
  19. 19.Which is closest to 895 + 504 + 97? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  20. 20.Round 38.08 to one decimal place. =
  21. 21.Which is closest to 501 × 70? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  22. 22.Round 56.29 to one decimal place. =
  23. 23.Round 7302 to the nearest ten.
  24. 24.Which is closest to 595 + 104 + 695? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  25. 25.Which is closest to 104 + 601 + 297? (a) 900 (b) 1000 (c) 1100 (d) 1200
  26. 26.Which is closest to 501 × 78? (Round each number first.) (a) 80000 (b) 400000 (c) 40000 (d) 4000
  27. 27.Round 87.28 to one decimal place. =
  28. 28.Which is closest to 2395 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
  29. 29.Round 52.22 to one decimal place. =
  30. 30.Which is closest to 793 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  31. 31.Round 84842 to the nearest hundred.
  32. 32.Round 27314 to the nearest hundred.
  33. 33.Round 55464 to the nearest thousand.
  34. 34.Which is closest to 903 + 395 + 297? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  35. 35.Which is closest to 2694 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  36. 36.Which is closest to 900 × 82? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  37. 37.Which is closest to 801 × 30? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  38. 38.Which is closest to 2102 ÷ 29? (a) 140 (b) 700 (c) 70 (d) 35
  39. 39.Round 92.43 to one decimal place. =
  40. 40.Round 25008 to the nearest thousand.

Answer key

  1. 1600
  2. 55.2
  3. 70
  4. 38.6
  5. 40
  6. 5000
  7. 28.7
  8. 89200
  9. 300
  10. 41.7
  11. 16000
  12. 10.8
  13. 10000
  14. 15000
  15. 60
  16. 90
  17. 44.3
  18. 38940
  19. 1500
  20. 38.1
  21. 35000
  22. 56.3
  23. 7300
  24. 1400
  25. 1000
  26. 40000
  27. 87.3
  28. 60
  29. 52.2
  30. 20
  31. 84800
  32. 27300
  33. 55000
  34. 1600
  35. 90
  36. 72000
  37. 24000
  38. 70
  39. 92.4
  40. 25000

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