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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 892 · 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 23.16 to one decimal place. =
  2. 2.Round 50.51 to one decimal place. =
  3. 3.Which is closest to 399 + 797 + 699? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  4. 4.Round 97.09 to one decimal place. =
  5. 5.Round 41868 to the nearest thousand.
  6. 6.Round 89598 to the nearest thousand.
  7. 7.Which is closest to 2399 ÷ 39? (a) 120 (b) 600 (c) 60 (d) 30
  8. 8.Round 40.37 to one decimal place. =
  9. 9.Which is closest to 400 + 197 + 897? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  10. 10.Which is closest to 197 × 79? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  11. 11.Round 12.44 to one decimal place. =
  12. 12.Which is closest to 199 + 698 + 696? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  13. 13.Which is closest to 805 + 795 + 897? (a) 2400 (b) 2500 (c) 2600 (d) 2700
  14. 14.Which is closest to 902 × 78? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  15. 15.Which is closest to 596 × 28? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  16. 16.Round 63982 to the nearest ten.
  17. 17.Which is closest to 2393 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  18. 18.Which is closest to 303 × 82? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  19. 19.Which is closest to 991 ÷ 49? (a) 40 (b) 200 (c) 10 (d) 20
  20. 20.Round 89.27 to one decimal place. =
  21. 21.Which is closest to 605 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  22. 22.Which is closest to 500 + 796 + 203? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  23. 23.Which is closest to 1795 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  24. 24.Round 52.43 to one decimal place. =
  25. 25.Which is closest to 199 × 40? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  26. 26.Round 36.38 to one decimal place. =
  27. 27.Round 45.37 to one decimal place. =
  28. 28.Round 63.22 to one decimal place. =
  29. 29.Round 13318 to the nearest hundred.
  30. 30.Round 89.07 to one decimal place. =
  31. 31.Round 79.28 to one decimal place. =
  32. 32.Which is closest to 202 + 203 + 295? (a) 900 (b) 800 (c) 600 (d) 700
  33. 33.Round 9364 to the nearest thousand.
  34. 34.Round 16.71 to one decimal place. =
  35. 35.Which is closest to 2404 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  36. 36.Which is closest to 304 + 496 + 398? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  37. 37.Which is closest to 802 + 602 + 297? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  38. 38.Round 46.36 to one decimal place. =
  39. 39.Which is closest to 501 + 298 + 498? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  40. 40.Which is closest to 2995 ÷ 49? (a) 120 (b) 60 (c) 30 (d) 600

Answer key

  1. 23.2
  2. 50.5
  3. 1900
  4. 97.1
  5. 42000
  6. 90000
  7. 60
  8. 40.4
  9. 1500
  10. 16000
  11. 12.4
  12. 1600
  13. 2500
  14. 72000
  15. 18000
  16. 63980
  17. 80
  18. 24000
  19. 20
  20. 89.3
  21. 20
  22. 1500
  23. 60
  24. 52.4
  25. 8000
  26. 36.4
  27. 45.4
  28. 63.2
  29. 13300
  30. 89.1
  31. 79.3
  32. 700
  33. 9000
  34. 16.7
  35. 80
  36. 1200
  37. 1700
  38. 46.4
  39. 1300
  40. 60

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