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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 453 · 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 32.44 to one decimal place. =
  2. 2.Which is closest to 799 + 102 + 796? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  3. 3.Which is closest to 698 × 49? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  4. 4.Round 76.81 to one decimal place. =
  5. 5.Round 28.77 to one decimal place. =
  6. 6.Round 46.91 to one decimal place. =
  7. 7.Which is closest to 901 × 49? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
  8. 8.Which is closest to 4001 ÷ 49? (a) 80 (b) 160 (c) 800 (d) 40
  9. 9.Round 13.07 to one decimal place. =
  10. 10.Which is closest to 3003 ÷ 51? (a) 120 (b) 30 (c) 600 (d) 60
  11. 11.Which is closest to 502 × 28? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  12. 12.Round 55906 to the nearest hundred.
  13. 13.Which is closest to 602 × 61? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  14. 14.Which is closest to 197 × 51? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  15. 15.Which is closest to 397 × 18? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  16. 16.Round 56614 to the nearest ten.
  17. 17.Which is closest to 200 + 502 + 699? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  18. 18.Which is closest to 396 + 800 + 296? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  19. 19.Which is closest to 600 + 204 + 305? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  20. 20.Which is closest to 799 + 899 + 505? (a) 2200 (b) 2100 (c) 2300 (d) 2400
  21. 21.Which is closest to 297 × 29? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  22. 22.Which is closest to 296 + 402 + 195? (a) 1000 (b) 900 (c) 1100 (d) 800
  23. 23.Which is closest to 600 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  24. 24.Round 88.37 to one decimal place. =
  25. 25.Round 82281 to the nearest ten.
  26. 26.Which is closest to 696 + 100 + 297? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  27. 27.Which is closest to 1009 ÷ 49? (a) 20 (b) 40 (c) 10 (d) 200
  28. 28.Which is closest to 1193 ÷ 29? (a) 400 (b) 40 (c) 80 (d) 20
  29. 29.Which is closest to 1008 ÷ 21? (a) 25 (b) 500 (c) 50 (d) 100
  30. 30.Which is closest to 97 + 796 + 305? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  31. 31.Which is closest to 895 + 205 + 95? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  32. 32.Round 33.66 to one decimal place. =
  33. 33.Round 42047 to the nearest thousand.
  34. 34.Round 63.91 to one decimal place. =
  35. 35.Which is closest to 1806 ÷ 19? (a) 45 (b) 180 (c) 900 (d) 90
  36. 36.Which is closest to 1208 ÷ 29? (a) 80 (b) 40 (c) 400 (d) 20
  37. 37.Round 54843 to the nearest thousand.
  38. 38.Which is closest to 900 + 95 + 497? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  39. 39.Which is closest to 4004 ÷ 49? (a) 40 (b) 80 (c) 800 (d) 160
  40. 40.Which is closest to 991 ÷ 49? (a) 20 (b) 40 (c) 200 (d) 10

Answer key

  1. 32.4
  2. 1700
  3. 35000
  4. 76.8
  5. 28.8
  6. 46.9
  7. 45000
  8. 80
  9. 13.1
  10. 60
  11. 15000
  12. 55900
  13. 36000
  14. 10000
  15. 8000
  16. 56610
  17. 1400
  18. 1500
  19. 1100
  20. 2200
  21. 9000
  22. 900
  23. 12000
  24. 88.4
  25. 82280
  26. 1100
  27. 20
  28. 40
  29. 50
  30. 1200
  31. 1200
  32. 33.7
  33. 42000
  34. 63.9
  35. 90
  36. 40
  37. 55000
  38. 1500
  39. 80
  40. 20

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