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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 332 · 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 3008 ÷ 51? (a) 30 (b) 120 (c) 60 (d) 600
  2. 2.Round 3951 to the nearest ten.
  3. 3.Which is closest to 800 + 902 + 902? (a) 2800 (b) 2700 (c) 2500 (d) 2600
  4. 4.Which is closest to 898 + 801 + 501? (a) 2400 (b) 2100 (c) 2200 (d) 2300
  5. 5.Round 81.87 to one decimal place. =
  6. 6.Round 45308 to the nearest ten.
  7. 7.Round 17588 to the nearest ten.
  8. 8.Which is closest to 105 + 198 + 702? (a) 1000 (b) 1100 (c) 1200 (d) 900
  9. 9.Which is closest to 897 × 90? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000
  10. 10.Round 95.42 to one decimal place. =
  11. 11.Round 8427 to the nearest hundred.
  12. 12.Round 68.82 to one decimal place. =
  13. 13.Which is closest to 295 + 404 + 895? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  14. 14.Round 11.64 to one decimal place. =
  15. 15.Which is closest to 899 ÷ 31? (a) 300 (b) 30 (c) 15 (d) 60
  16. 16.Which is closest to 3506 ÷ 49? (a) 70 (b) 140 (c) 35 (d) 700
  17. 17.Which is closest to 905 + 205 + 897? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  18. 18.Which is closest to 701 + 405 + 602? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  19. 19.Round 72921 to the nearest hundred.
  20. 20.Round 59.16 to one decimal place. =
  21. 21.Which is closest to 705 + 203 + 105? (a) 1100 (b) 1200 (c) 1000 (d) 900
  22. 22.Round 87682 to the nearest ten.
  23. 23.Round 43.13 to one decimal place. =
  24. 24.Which is closest to 798 × 89? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  25. 25.Round 49167 to the nearest thousand.
  26. 26.Round 67.68 to one decimal place. =
  27. 27.Which is closest to 794 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  28. 28.Which is closest to 904 × 50? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
  29. 29.Round 97832 to the nearest thousand.
  30. 30.Round 48675 to the nearest hundred.
  31. 31.Round 15494 to the nearest ten.
  32. 32.Round 8058 to the nearest hundred.
  33. 33.Which is closest to 502 × 92? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  34. 34.Which is closest to 297 × 58? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  35. 35.Which is closest to 499 + 505 + 695? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  36. 36.Round 54.58 to one decimal place. =
  37. 37.Round 58934 to the nearest thousand.
  38. 38.Which is closest to 504 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  39. 39.Which is closest to 2091 ÷ 31? (a) 70 (b) 140 (c) 700 (d) 35
  40. 40.Which is closest to 696 + 897 + 105? (a) 1700 (b) 1900 (c) 1800 (d) 1600

Answer key

  1. 60
  2. 3950
  3. 2600
  4. 2200
  5. 81.9
  6. 45310
  7. 17590
  8. 1000
  9. 81000
  10. 95.4
  11. 8400
  12. 68.8
  13. 1600
  14. 11.6
  15. 30
  16. 70
  17. 2000
  18. 1700
  19. 72900
  20. 59.2
  21. 1000
  22. 87680
  23. 43.1
  24. 72000
  25. 49000
  26. 67.7
  27. 20
  28. 45000
  29. 98000
  30. 48700
  31. 15490
  32. 8100
  33. 45000
  34. 18000
  35. 1700
  36. 54.6
  37. 59000
  38. 15000
  39. 70
  40. 1700

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