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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 624 · 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 101 + 600 + 198? (a) 1000 (b) 800 (c) 1100 (d) 900
  2. 2.Which is closest to 897 + 198 + 95? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  3. 3.Which is closest to 405 + 97 + 99? (a) 800 (b) 600 (c) 700 (d) 500
  4. 4.Round 91.86 to one decimal place. =
  5. 5.Round 70.36 to one decimal place. =
  6. 6.Round 92.36 to one decimal place. =
  7. 7.Which is closest to 705 + 597 + 904? (a) 2400 (b) 2200 (c) 2300 (d) 2100
  8. 8.Which is closest to 699 + 98 + 797? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  9. 9.Which is closest to 1199 ÷ 39? (a) 300 (b) 30 (c) 60 (d) 15
  10. 10.Which is closest to 805 + 297 + 103? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  11. 11.Which is closest to 96 + 99 + 400? (a) 600 (b) 500 (c) 700 (d) 800
  12. 12.Which is closest to 2794 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  13. 13.Which is closest to 1805 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  14. 14.Which is closest to 392 ÷ 21? (a) 10 (b) 20 (c) 40 (d) 200
  15. 15.Which is closest to 598 × 70? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  16. 16.Which is closest to 497 × 29? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  17. 17.Which is closest to 902 + 802 + 797? (a) 2700 (b) 2600 (c) 2400 (d) 2500
  18. 18.Which is closest to 897 + 596 + 201? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  19. 19.Which is closest to 902 × 41? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  20. 20.Round 84111 to the nearest hundred.
  21. 21.Which is closest to 603 × 69? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  22. 22.Round 50184 to the nearest ten.
  23. 23.Which is closest to 200 × 82? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  24. 24.Which is closest to 198 + 99 + 704? (a) 1100 (b) 900 (c) 1200 (d) 1000
  25. 25.Which is closest to 198 + 799 + 295? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  26. 26.Which is closest to 896 + 97 + 102? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  27. 27.Which is closest to 295 + 205 + 598? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  28. 28.Which is closest to 801 + 305 + 199? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  29. 29.Round 6836 to the nearest hundred.
  30. 30.Which is closest to 501 × 18? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  31. 31.Round 39.17 to one decimal place. =
  32. 32.Which is closest to 907 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  33. 33.Which is closest to 3192 ÷ 41? (a) 80 (b) 160 (c) 40 (d) 800
  34. 34.Round 53542 to the nearest hundred.
  35. 35.Round 44.72 to one decimal place. =
  36. 36.Which is closest to 198 + 104 + 395? (a) 800 (b) 700 (c) 900 (d) 600
  37. 37.Which is closest to 2705 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  38. 38.Round 51739 to the nearest hundred.
  39. 39.Round 66.22 to one decimal place. =
  40. 40.Which is closest to 1598 ÷ 21? (a) 800 (b) 80 (c) 40 (d) 160

Answer key

  1. 900
  2. 1200
  3. 600
  4. 91.9
  5. 70.4
  6. 92.4
  7. 2200
  8. 1600
  9. 30
  10. 1200
  11. 600
  12. 70
  13. 90
  14. 20
  15. 42000
  16. 15000
  17. 2500
  18. 1700
  19. 36000
  20. 84100
  21. 42000
  22. 50180
  23. 16000
  24. 1000
  25. 1300
  26. 1100
  27. 1100
  28. 1300
  29. 6800
  30. 10000
  31. 39.2
  32. 30
  33. 80
  34. 53500
  35. 44.7
  36. 700
  37. 90
  38. 51700
  39. 66.2
  40. 80

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