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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 900 · 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 501 + 804 + 304? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  2. 2.Which is closest to 705 + 602 + 105? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  3. 3.Which is closest to 496 + 597 + 197? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  4. 4.Round 24855 to the nearest thousand.
  5. 5.Round 85079 to the nearest ten.
  6. 6.Round 95.31 to one decimal place. =
  7. 7.Round 13410 to the nearest hundred.
  8. 8.Round 45.79 to one decimal place. =
  9. 9.Which is closest to 200 + 705 + 698? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  10. 10.Which is closest to 696 × 49? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  11. 11.Which is closest to 199 × 70? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  12. 12.Which is closest to 903 × 20? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  13. 13.Round 14.13 to one decimal place. =
  14. 14.Which is closest to 803 × 71? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  15. 15.Which is closest to 1508 ÷ 29? (a) 500 (b) 100 (c) 25 (d) 50
  16. 16.Round 79.22 to one decimal place. =
  17. 17.Which is closest to 200 × 29? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  18. 18.Round 63186 to the nearest thousand.
  19. 19.Round 36.24 to one decimal place. =
  20. 20.Round 66.67 to one decimal place. =
  21. 21.Which is closest to 3007 ÷ 51? (a) 600 (b) 60 (c) 120 (d) 30
  22. 22.Which is closest to 204 + 300 + 904? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  23. 23.Which is closest to 1602 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  24. 24.Round 45881 to the nearest ten.
  25. 25.Which is closest to 991 ÷ 51? (a) 200 (b) 20 (c) 10 (d) 40
  26. 26.Which is closest to 496 × 30? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  27. 27.Round 23743 to the nearest hundred.
  28. 28.Round 46.36 to one decimal place. =
  29. 29.Round 81.46 to one decimal place. =
  30. 30.Which is closest to 399 + 103 + 700? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  31. 31.Which is closest to 302 + 803 + 604? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  32. 32.Round 31.79 to one decimal place. =
  33. 33.Round 63.54 to one decimal place. =
  34. 34.Round 59.61 to one decimal place. =
  35. 35.Which is closest to 2397 ÷ 39? (a) 30 (b) 60 (c) 120 (d) 600
  36. 36.Which is closest to 398 × 28? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  37. 37.Round 35.78 to one decimal place. =
  38. 38.Round 35.66 to one decimal place. =
  39. 39.Round 79573 to the nearest thousand.
  40. 40.Which is closest to 902 + 901 + 605? (a) 2500 (b) 2600 (c) 2400 (d) 2300

Answer key

  1. 1600
  2. 1400
  3. 1300
  4. 25000
  5. 85080
  6. 95.3
  7. 13400
  8. 45.8
  9. 1600
  10. 35000
  11. 14000
  12. 18000
  13. 14.1
  14. 56000
  15. 50
  16. 79.2
  17. 6000
  18. 63000
  19. 36.2
  20. 66.7
  21. 60
  22. 1400
  23. 40
  24. 45880
  25. 20
  26. 15000
  27. 23700
  28. 46.4
  29. 81.5
  30. 1200
  31. 1700
  32. 31.8
  33. 63.5
  34. 59.6
  35. 60
  36. 12000
  37. 35.8
  38. 35.7
  39. 80000
  40. 2400

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