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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 598 · 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.Which is closest to 902 + 895 + 695? (a) 2500 (b) 2600 (c) 2700 (d) 2400
  2. 2.Which is closest to 497 × 80? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
  3. 3.Which is closest to 596 + 300 + 398? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  4. 4.Which is closest to 799 × 81? (Round each number first.) (a) 64000 (b) 640000 (c) 128000 (d) 6400
  5. 5.Round 39.39 to one decimal place. =
  6. 6.Round 35.48 to one decimal place. =
  7. 7.Which is closest to 199 + 505 + 401? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  8. 8.Which is closest to 297 × 42? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  9. 9.Which is closest to 1809 ÷ 21? (a) 900 (b) 45 (c) 90 (d) 180
  10. 10.Round 71.84 to one decimal place. =
  11. 11.Which is closest to 698 × 90? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  12. 12.Which is closest to 3203 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40
  13. 13.Round 17.06 to one decimal place. =
  14. 14.Round 15095 to the nearest hundred.
  15. 15.Which is closest to 497 × 69? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  16. 16.Round 26742 to the nearest thousand.
  17. 17.Round 89376 to the nearest ten.
  18. 18.Which is closest to 1802 ÷ 21? (a) 900 (b) 45 (c) 90 (d) 180
  19. 19.Which is closest to 1002 ÷ 21? (a) 50 (b) 100 (c) 500 (d) 25
  20. 20.Round 13.59 to one decimal place. =
  21. 21.Which is closest to 502 + 205 + 305? (a) 900 (b) 1200 (c) 1100 (d) 1000
  22. 22.Round 67.78 to one decimal place. =
  23. 23.Which is closest to 600 + 201 + 903? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  24. 24.Which is closest to 300 × 22? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  25. 25.Which is closest to 499 × 79? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
  26. 26.Round 33.33 to one decimal place. =
  27. 27.Which is closest to 2393 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  28. 28.Which is closest to 1405 ÷ 21? (a) 35 (b) 70 (c) 700 (d) 140
  29. 29.Which is closest to 796 + 903 + 295? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  30. 30.Round 29.73 to one decimal place. =
  31. 31.Which is closest to 703 + 595 + 601? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  32. 32.Round 63.82 to one decimal place. =
  33. 33.Round 68337 to the nearest thousand.
  34. 34.Which is closest to 701 + 297 + 902? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  35. 35.Which is closest to 498 + 201 + 604? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  36. 36.Which is closest to 404 × 62? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  37. 37.Round 35235 to the nearest hundred.
  38. 38.Round 62716 to the nearest thousand.
  39. 39.Which is closest to 103 + 100 + 295? (a) 600 (b) 400 (c) 700 (d) 500
  40. 40.Which is closest to 798 × 39? (Round each number first.) (a) 32000 (b) 320000 (c) 64000 (d) 3200

Answer key

  1. 2500
  2. 40000
  3. 1300
  4. 64000
  5. 39.4
  6. 35.5
  7. 1100
  8. 12000
  9. 90
  10. 71.8
  11. 63000
  12. 80
  13. 17.1
  14. 15100
  15. 35000
  16. 27000
  17. 89380
  18. 90
  19. 50
  20. 13.6
  21. 1000
  22. 67.8
  23. 1700
  24. 6000
  25. 40000
  26. 33.3
  27. 80
  28. 70
  29. 2000
  30. 29.7
  31. 1900
  32. 63.8
  33. 68000
  34. 1900
  35. 1300
  36. 24000
  37. 35200
  38. 63000
  39. 500
  40. 32000

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