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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 61 · 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 597 × 51? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  2. 2.Which is closest to 899 × 20? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  3. 3.Round 20849 to the nearest ten.
  4. 4.Round 62.42 to one decimal place. =
  5. 5.Round 99.88 to one decimal place. =
  6. 6.Which is closest to 898 + 104 + 501? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  7. 7.Which is closest to 2494 ÷ 51? (a) 100 (b) 50 (c) 500 (d) 25
  8. 8.Which is closest to 896 × 49? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  9. 9.Which is closest to 1502 ÷ 49? (a) 60 (b) 30 (c) 15 (d) 300
  10. 10.Round 45.44 to one decimal place. =
  11. 11.Which is closest to 300 + 199 + 201? (a) 900 (b) 700 (c) 600 (d) 800
  12. 12.Which is closest to 105 + 295 + 399? (a) 900 (b) 1000 (c) 700 (d) 800
  13. 13.Which is closest to 805 + 595 + 799? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  14. 14.Which is closest to 897 × 39? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  15. 15.Which is closest to 905 + 202 + 898? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  16. 16.Which is closest to 1507 ÷ 51? (a) 30 (b) 60 (c) 15 (d) 300
  17. 17.Which is closest to 804 × 91? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  18. 18.Round 43.71 to one decimal place. =
  19. 19.Which is closest to 104 + 597 + 500? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  20. 20.Round 13.86 to one decimal place. =
  21. 21.Round 16314 to the nearest thousand.
  22. 22.Round 49.23 to one decimal place. =
  23. 23.Which is closest to 801 + 105 + 295? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  24. 24.Which is closest to 305 + 895 + 300? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  25. 25.Which is closest to 304 + 797 + 198? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  26. 26.Which is closest to 505 + 405 + 603? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  27. 27.Which is closest to 700 + 505 + 100? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  28. 28.Which is closest to 301 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  29. 29.Round 57486 to the nearest ten.
  30. 30.Which is closest to 3196 ÷ 41? (a) 40 (b) 160 (c) 80 (d) 800
  31. 31.Round 33604 to the nearest hundred.
  32. 32.Round 45836 to the nearest ten.
  33. 33.Which is closest to 103 + 97 + 799? (a) 900 (b) 1100 (c) 1200 (d) 1000
  34. 34.Round 83.17 to one decimal place. =
  35. 35.Round 38.37 to one decimal place. =
  36. 36.Which is closest to 98 + 700 + 704? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  37. 37.Which is closest to 602 + 798 + 100? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  38. 38.Which is closest to 201 × 39? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  39. 39.Round 90917 to the nearest ten.
  40. 40.Round 94983 to the nearest ten.

Answer key

  1. 30000
  2. 18000
  3. 20850
  4. 62.4
  5. 99.9
  6. 1500
  7. 50
  8. 45000
  9. 30
  10. 45.4
  11. 700
  12. 800
  13. 2200
  14. 36000
  15. 2000
  16. 30
  17. 72000
  18. 43.7
  19. 1200
  20. 13.9
  21. 16000
  22. 49.2
  23. 1200
  24. 1500
  25. 1300
  26. 1500
  27. 1300
  28. 27000
  29. 57490
  30. 80
  31. 33600
  32. 45840
  33. 1000
  34. 83.2
  35. 38.4
  36. 1500
  37. 1500
  38. 8000
  39. 90920
  40. 94980

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