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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 3 · 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 50.59 to one decimal place. =
  2. 2.Which is closest to 498 + 695 + 202? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  3. 3.Which is closest to 604 × 41? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  4. 4.Round 31.49 to one decimal place. =
  5. 5.Which is closest to 401 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  6. 6.Round 44533 to the nearest ten.
  7. 7.Round 88.13 to one decimal place. =
  8. 8.Round 76.78 to one decimal place. =
  9. 9.Round 89184 to the nearest hundred.
  10. 10.Round 26034 to the nearest thousand.
  11. 11.Round 79.38 to one decimal place. =
  12. 12.Round 14766 to the nearest ten.
  13. 13.Which is closest to 1492 ÷ 31? (a) 500 (b) 100 (c) 25 (d) 50
  14. 14.Which is closest to 197 × 29? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  15. 15.Which is closest to 202 × 49? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  16. 16.Which is closest to 902 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  17. 17.Round 23534 to the nearest ten.
  18. 18.Round 32651 to the nearest hundred.
  19. 19.Which is closest to 3995 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  20. 20.Which is closest to 901 ÷ 29? (a) 60 (b) 15 (c) 30 (d) 300
  21. 21.Round 72072 to the nearest thousand.
  22. 22.Round 7417 to the nearest ten.
  23. 23.Round 20434 to the nearest thousand.
  24. 24.Which is closest to 397 + 503 + 497? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  25. 25.Which is closest to 796 + 905 + 398? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  26. 26.Which is closest to 699 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  27. 27.Which is closest to 802 + 405 + 699? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  28. 28.Round 9391 to the nearest ten.
  29. 29.Which is closest to 1004 ÷ 19? (a) 100 (b) 500 (c) 50 (d) 25
  30. 30.Round 66272 to the nearest thousand.
  31. 31.Round 99422 to the nearest ten.
  32. 32.Round 31.62 to one decimal place. =
  33. 33.Round 40.53 to one decimal place. =
  34. 34.Which is closest to 2691 ÷ 29? (a) 180 (b) 900 (c) 90 (d) 45
  35. 35.Round 25.58 to one decimal place. =
  36. 36.Which is closest to 995 ÷ 19? (a) 500 (b) 50 (c) 100 (d) 25
  37. 37.Which is closest to 797 + 905 + 499? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  38. 38.Round 24.81 to one decimal place. =
  39. 39.Which is closest to 102 + 197 + 895? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  40. 40.Which is closest to 599 × 62? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000

Answer key

  1. 50.6
  2. 1400
  3. 24000
  4. 31.5
  5. 12000
  6. 44530
  7. 88.1
  8. 76.8
  9. 89200
  10. 26000
  11. 79.4
  12. 14770
  13. 50
  14. 6000
  15. 10000
  16. 30
  17. 23530
  18. 32700
  19. 80
  20. 30
  21. 72000
  22. 7420
  23. 20000
  24. 1400
  25. 2100
  26. 14000
  27. 1900
  28. 9390
  29. 50
  30. 66000
  31. 99420
  32. 31.6
  33. 40.5
  34. 90
  35. 25.6
  36. 50
  37. 2200
  38. 24.8
  39. 1200
  40. 36000

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