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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 876 · 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.Round 68664 to the nearest ten.
  2. 2.Round 66.83 to one decimal place. =
  3. 3.Which is closest to 599 + 295 + 102? (a) 1100 (b) 900 (c) 1200 (d) 1000
  4. 4.Which is closest to 2805 ÷ 39? (a) 70 (b) 700 (c) 35 (d) 140
  5. 5.Which is closest to 609 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  6. 6.Round 38375 to the nearest hundred.
  7. 7.Round 74649 to the nearest hundred.
  8. 8.Which is closest to 2796 ÷ 39? (a) 35 (b) 700 (c) 70 (d) 140
  9. 9.Which is closest to 699 × 28? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  10. 10.Which is closest to 102 + 196 + 99? (a) 600 (b) 400 (c) 300 (d) 500
  11. 11.Which is closest to 796 × 88? (Round each number first.) (a) 72000 (b) 144000 (c) 7200 (d) 720000
  12. 12.Round 61.77 to one decimal place. =
  13. 13.Which is closest to 801 + 902 + 304? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  14. 14.Round 17.57 to one decimal place. =
  15. 15.Which is closest to 1508 ÷ 31? (a) 50 (b) 100 (c) 25 (d) 500
  16. 16.Which is closest to 205 + 697 + 598? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  17. 17.Which is closest to 3199 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  18. 18.Which is closest to 801 × 88? (Round each number first.) (a) 144000 (b) 7200 (c) 72000 (d) 720000
  19. 19.Round 42.74 to one decimal place. =
  20. 20.Which is closest to 703 × 90? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  21. 21.Round 34.12 to one decimal place. =
  22. 22.Round 68.19 to one decimal place. =
  23. 23.Round 63101 to the nearest thousand.
  24. 24.Round 41255 to the nearest thousand.
  25. 25.Which is closest to 502 × 91? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  26. 26.Which is closest to 204 × 30? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  27. 27.Which is closest to 803 ÷ 19? (a) 400 (b) 40 (c) 20 (d) 80
  28. 28.Round 64430 to the nearest hundred.
  29. 29.Round 4981 to the nearest ten.
  30. 30.Round 62330 to the nearest hundred.
  31. 31.Which is closest to 100 + 497 + 100? (a) 600 (b) 800 (c) 900 (d) 700
  32. 32.Which is closest to 1404 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  33. 33.Which is closest to 597 × 61? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  34. 34.Round 65848 to the nearest thousand.
  35. 35.Which is closest to 496 × 69? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  36. 36.Round 56945 to the nearest hundred.
  37. 37.Which is closest to 303 + 396 + 299? (a) 900 (b) 1000 (c) 1200 (d) 1100
  38. 38.Which is closest to 3205 ÷ 39? (a) 800 (b) 40 (c) 160 (d) 80
  39. 39.Which is closest to 298 × 49? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  40. 40.Round 52922 to the nearest ten.

Answer key

  1. 68660
  2. 66.8
  3. 1000
  4. 70
  5. 20
  6. 38400
  7. 74600
  8. 70
  9. 21000
  10. 400
  11. 72000
  12. 61.8
  13. 2000
  14. 17.6
  15. 50
  16. 1500
  17. 80
  18. 72000
  19. 42.7
  20. 63000
  21. 34.1
  22. 68.2
  23. 63000
  24. 41000
  25. 45000
  26. 6000
  27. 40
  28. 64400
  29. 4980
  30. 62300
  31. 700
  32. 70
  33. 36000
  34. 66000
  35. 35000
  36. 56900
  37. 1000
  38. 80
  39. 15000
  40. 52920

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