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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 744 · 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 63.34 to one decimal place. =
  2. 2.Which is closest to 703 + 897 + 304? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  3. 3.Round 18569 to the nearest ten.
  4. 4.Which is closest to 398 + 499 + 898? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  5. 5.Round 68804 to the nearest ten.
  6. 6.Round 10.94 to one decimal place. =
  7. 7.Round 73812 to the nearest ten.
  8. 8.Which is closest to 296 × 39? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  9. 9.Which is closest to 402 + 396 + 899? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  10. 10.Which is closest to 304 × 90? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  11. 11.Which is closest to 796 + 495 + 102? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  12. 12.Which is closest to 602 + 899 + 699? (a) 2200 (b) 2100 (c) 2400 (d) 2300
  13. 13.Which is closest to 1795 ÷ 19? (a) 45 (b) 900 (c) 180 (d) 90
  14. 14.Which is closest to 998 ÷ 19? (a) 25 (b) 100 (c) 50 (d) 500
  15. 15.Round 66.83 to one decimal place. =
  16. 16.Which is closest to 1508 ÷ 51? (a) 300 (b) 30 (c) 15 (d) 60
  17. 17.Which is closest to 3001 ÷ 51? (a) 30 (b) 120 (c) 60 (d) 600
  18. 18.Which is closest to 4506 ÷ 51? (a) 900 (b) 180 (c) 45 (d) 90
  19. 19.Which is closest to 596 × 39? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  20. 20.Round 24.63 to one decimal place. =
  21. 21.Round 72.49 to one decimal place. =
  22. 22.Which is closest to 1504 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
  23. 23.Round 51862 to the nearest thousand.
  24. 24.Round 15.79 to one decimal place. =
  25. 25.Which is closest to 500 × 29? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  26. 26.Which is closest to 698 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  27. 27.Which is closest to 399 + 597 + 296? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  28. 28.Round 63.57 to one decimal place. =
  29. 29.Round 35.81 to one decimal place. =
  30. 30.Which is closest to 201 + 196 + 104? (a) 700 (b) 400 (c) 600 (d) 500
  31. 31.Which is closest to 803 × 40? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  32. 32.Which is closest to 1601 ÷ 41? (a) 20 (b) 40 (c) 80 (d) 400
  33. 33.Which is closest to 797 ÷ 19? (a) 20 (b) 40 (c) 400 (d) 80
  34. 34.Which is closest to 198 × 49? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  35. 35.Round 49643 to the nearest thousand.
  36. 36.Which is closest to 3605 ÷ 39? (a) 90 (b) 900 (c) 45 (d) 180
  37. 37.Round 78.82 to one decimal place. =
  38. 38.Which is closest to 797 × 49? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  39. 39.Round 16.52 to one decimal place. =
  40. 40.Round 15.26 to one decimal place. =

Answer key

  1. 63.3
  2. 1900
  3. 18570
  4. 1800
  5. 68800
  6. 10.9
  7. 73810
  8. 12000
  9. 1700
  10. 27000
  11. 1400
  12. 2200
  13. 90
  14. 50
  15. 66.8
  16. 30
  17. 60
  18. 90
  19. 24000
  20. 24.6
  21. 72.5
  22. 30
  23. 52000
  24. 15.8
  25. 15000
  26. 21000
  27. 1300
  28. 63.6
  29. 35.8
  30. 500
  31. 32000
  32. 40
  33. 40
  34. 10000
  35. 50000
  36. 90
  37. 78.8
  38. 40000
  39. 16.5
  40. 15.3

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