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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 836 · 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 697 + 605 + 799? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  2. 2.Which is closest to 204 × 29? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  3. 3.Which is closest to 902 × 49? (Round each number first.) (a) 45000 (b) 90000 (c) 450000 (d) 4500
  4. 4.Which is closest to 903 ÷ 29? (a) 15 (b) 60 (c) 30 (d) 300
  5. 5.Which is closest to 301 + 895 + 396? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  6. 6.Round 21.37 to one decimal place. =
  7. 7.Round 17469 to the nearest ten.
  8. 8.Which is closest to 3193 ÷ 39? (a) 80 (b) 800 (c) 40 (d) 160
  9. 9.Which is closest to 904 × 88? (Round each number first.) (a) 81000 (b) 162000 (c) 810000 (d) 8100
  10. 10.Which is closest to 1004 ÷ 51? (a) 20 (b) 40 (c) 200 (d) 10
  11. 11.Which is closest to 498 + 198 + 400? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  12. 12.Round 99.93 to one decimal place. =
  13. 13.Round 77.08 to one decimal place. =
  14. 14.Which is closest to 1196 ÷ 19? (a) 60 (b) 120 (c) 600 (d) 30
  15. 15.Which is closest to 300 × 42? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  16. 16.Which is closest to 102 + 896 + 398? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  17. 17.Which is closest to 900 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  18. 18.Round 26.19 to one decimal place. =
  19. 19.Which is closest to 592 ÷ 21? (a) 15 (b) 60 (c) 30 (d) 300
  20. 20.Which is closest to 2001 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  21. 21.Which is closest to 98 + 99 + 899? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  22. 22.Which is closest to 2704 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
  23. 23.Which is closest to 496 × 19? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  24. 24.Round 5561 to the nearest ten.
  25. 25.Which is closest to 3197 ÷ 39? (a) 160 (b) 40 (c) 800 (d) 80
  26. 26.Round 63.87 to one decimal place. =
  27. 27.Which is closest to 101 + 505 + 604? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  28. 28.Which is closest to 805 + 502 + 699? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  29. 29.Round 5741 to the nearest ten.
  30. 30.Which is closest to 800 + 605 + 105? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  31. 31.Round 78.23 to one decimal place. =
  32. 32.Which is closest to 991 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  33. 33.Which is closest to 504 + 400 + 305? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  34. 34.Which is closest to 600 + 904 + 795? (a) 2500 (b) 2300 (c) 2400 (d) 2200
  35. 35.Which is closest to 702 × 52? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  36. 36.Which is closest to 597 + 398 + 204? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  37. 37.Round 24.88 to one decimal place. =
  38. 38.Which is closest to 1603 ÷ 41? (a) 400 (b) 20 (c) 80 (d) 40
  39. 39.Which is closest to 799 + 296 + 802? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  40. 40.Which is closest to 598 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000

Answer key

  1. 2100
  2. 6000
  3. 45000
  4. 30
  5. 1600
  6. 21.4
  7. 17470
  8. 80
  9. 81000
  10. 20
  11. 1100
  12. 99.9
  13. 77.1
  14. 60
  15. 12000
  16. 1400
  17. 27000
  18. 26.2
  19. 30
  20. 40
  21. 1100
  22. 90
  23. 10000
  24. 5560
  25. 80
  26. 63.9
  27. 1200
  28. 2000
  29. 5740
  30. 1500
  31. 78.2
  32. 50
  33. 1200
  34. 2300
  35. 35000
  36. 1200
  37. 24.9
  38. 40
  39. 1900
  40. 12000

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