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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 596 · 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 97.26 to one decimal place. =
  2. 2.Which is closest to 594 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30
  3. 3.Round 13.07 to one decimal place. =
  4. 4.Which is closest to 505 + 503 + 398? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  5. 5.Which is closest to 199 × 18? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  6. 6.Round 41674 to the nearest thousand.
  7. 7.Which is closest to 196 + 901 + 299? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  8. 8.Which is closest to 501 + 203 + 298? (a) 1000 (b) 900 (c) 1100 (d) 1200
  9. 9.Round 34162 to the nearest thousand.
  10. 10.Which is closest to 398 + 496 + 201? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  11. 11.Which is closest to 295 + 497 + 797? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  12. 12.Which is closest to 705 + 795 + 200? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  13. 13.Which is closest to 1594 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  14. 14.Round 97.14 to one decimal place. =
  15. 15.Round 31.41 to one decimal place. =
  16. 16.Which is closest to 396 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  17. 17.Which is closest to 895 + 796 + 501? (a) 2100 (b) 2300 (c) 2200 (d) 2400
  18. 18.Round 47731 to the nearest thousand.
  19. 19.Which is closest to 2805 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  20. 20.Which is closest to 398 × 89? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  21. 21.Round 54.63 to one decimal place. =
  22. 22.Round 22629 to the nearest thousand.
  23. 23.Round 41859 to the nearest hundred.
  24. 24.Round 36978 to the nearest ten.
  25. 25.Which is closest to 702 + 901 + 203? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  26. 26.Round 72771 to the nearest ten.
  27. 27.Which is closest to 1494 ÷ 31? (a) 25 (b) 50 (c) 100 (d) 500
  28. 28.Round 52077 to the nearest hundred.
  29. 29.Which is closest to 1204 ÷ 39? (a) 60 (b) 30 (c) 300 (d) 15
  30. 30.Round 22427 to the nearest thousand.
  31. 31.Which is closest to 801 + 701 + 304? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  32. 32.Round 19867 to the nearest hundred.
  33. 33.Which is closest to 1597 ÷ 19? (a) 800 (b) 80 (c) 160 (d) 40
  34. 34.Round 73.84 to one decimal place. =
  35. 35.Round 21.51 to one decimal place. =
  36. 36.Round 46.71 to one decimal place. =
  37. 37.Which is closest to 797 × 69? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  38. 38.Round 21769 to the nearest thousand.
  39. 39.Which is closest to 203 + 104 + 897? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  40. 40.Which is closest to 204 × 78? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000

Answer key

  1. 97.3
  2. 30
  3. 13.1
  4. 1400
  5. 4000
  6. 42000
  7. 1400
  8. 1000
  9. 34000
  10. 1100
  11. 1600
  12. 1700
  13. 40
  14. 97.1
  15. 31.4
  16. 12000
  17. 2200
  18. 48000
  19. 70
  20. 36000
  21. 54.6
  22. 23000
  23. 41900
  24. 36980
  25. 1800
  26. 72770
  27. 50
  28. 52100
  29. 30
  30. 22000
  31. 1800
  32. 19900
  33. 80
  34. 73.8
  35. 21.5
  36. 46.7
  37. 56000
  38. 22000
  39. 1200
  40. 16000

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