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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 595 · 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 16.39 to one decimal place. =
  2. 2.Round 56.38 to one decimal place. =
  3. 3.Which is closest to 1201 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  4. 4.Round 50.87 to one decimal place. =
  5. 5.Which is closest to 800 + 605 + 304? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  6. 6.Round 35.48 to one decimal place. =
  7. 7.Which is closest to 802 × 19? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  8. 8.Round 93.59 to one decimal place. =
  9. 9.Which is closest to 395 + 901 + 898? (a) 2300 (b) 2200 (c) 2100 (d) 2400
  10. 10.Which is closest to 1002 ÷ 51? (a) 20 (b) 200 (c) 40 (d) 10
  11. 11.Round 10.83 to one decimal place. =
  12. 12.Which is closest to 798 + 198 + 199? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  13. 13.Which is closest to 1197 ÷ 39? (a) 30 (b) 15 (c) 60 (d) 300
  14. 14.Which is closest to 195 + 600 + 395? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  15. 15.Round 13.33 to one decimal place. =
  16. 16.Which is closest to 599 ÷ 29? (a) 200 (b) 40 (c) 20 (d) 10
  17. 17.Which is closest to 300 × 88? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  18. 18.Which is closest to 1591 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  19. 19.Which is closest to 895 + 204 + 195? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  20. 20.Round 16.11 to one decimal place. =
  21. 21.Round 10.68 to one decimal place. =
  22. 22.Round 81.72 to one decimal place. =
  23. 23.Which is closest to 2408 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  24. 24.Round 4898 to the nearest hundred.
  25. 25.Which is closest to 297 × 32? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  26. 26.Which is closest to 204 × 38? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  27. 27.Which is closest to 1606 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  28. 28.Which is closest to 103 + 795 + 904? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  29. 29.Round 75.18 to one decimal place. =
  30. 30.Round 26949 to the nearest ten.
  31. 31.Which is closest to 498 + 400 + 99? (a) 1000 (b) 1100 (c) 900 (d) 1200
  32. 32.Which is closest to 398 × 30? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  33. 33.Which is closest to 2495 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  34. 34.Which is closest to 800 + 698 + 299? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  35. 35.Which is closest to 403 + 502 + 598? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  36. 36.Round 61.17 to one decimal place. =
  37. 37.Which is closest to 900 + 502 + 102? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  38. 38.Which is closest to 607 ÷ 31? (a) 10 (b) 20 (c) 200 (d) 40
  39. 39.Round 19852 to the nearest thousand.
  40. 40.Round 51.66 to one decimal place. =

Answer key

  1. 16.4
  2. 56.4
  3. 60
  4. 50.9
  5. 1700
  6. 35.5
  7. 16000
  8. 93.6
  9. 2200
  10. 20
  11. 10.8
  12. 1200
  13. 30
  14. 1200
  15. 13.3
  16. 20
  17. 27000
  18. 80
  19. 1300
  20. 16.1
  21. 10.7
  22. 81.7
  23. 60
  24. 4900
  25. 9000
  26. 8000
  27. 40
  28. 1800
  29. 75.2
  30. 26950
  31. 1000
  32. 12000
  33. 50
  34. 1800
  35. 1500
  36. 61.2
  37. 1500
  38. 20
  39. 20000
  40. 51.7

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