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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 189 · 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 2492 ÷ 51? (a) 100 (b) 25 (c) 50 (d) 500
  2. 2.Round 12.73 to one decimal place. =
  3. 3.Which is closest to 399 + 195 + 703? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  4. 4.Which is closest to 698 × 89? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  5. 5.Which is closest to 698 × 48? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  6. 6.Which is closest to 196 + 398 + 595? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  7. 7.Round 49158 to the nearest hundred.
  8. 8.Round 95.91 to one decimal place. =
  9. 9.Which is closest to 599 × 80? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  10. 10.Which is closest to 402 × 38? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  11. 11.Which is closest to 604 × 18? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  12. 12.Which is closest to 393 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  13. 13.Which is closest to 200 + 598 + 504? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  14. 14.Which is closest to 801 × 29? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  15. 15.Which is closest to 1798 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  16. 16.Round 46.27 to one decimal place. =
  17. 17.Round 12481 to the nearest thousand.
  18. 18.Which is closest to 497 × 92? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  19. 19.Round 19.28 to one decimal place. =
  20. 20.Which is closest to 602 × 30? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  21. 21.Which is closest to 3005 ÷ 51? (a) 120 (b) 60 (c) 600 (d) 30
  22. 22.Which is closest to 296 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  23. 23.Which is closest to 2809 ÷ 39? (a) 700 (b) 35 (c) 70 (d) 140
  24. 24.Which is closest to 591 ÷ 29? (a) 20 (b) 200 (c) 10 (d) 40
  25. 25.Round 66973 to the nearest ten.
  26. 26.Which is closest to 794 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
  27. 27.Which is closest to 302 × 39? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  28. 28.Which is closest to 501 × 81? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  29. 29.Which is closest to 99 + 199 + 900? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  30. 30.Which is closest to 399 + 901 + 95? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  31. 31.Which is closest to 301 × 88? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  32. 32.Round 16.72 to one decimal place. =
  33. 33.Which is closest to 1791 ÷ 29? (a) 30 (b) 600 (c) 120 (d) 60
  34. 34.Which is closest to 98 + 102 + 102? (a) 400 (b) 500 (c) 200 (d) 300
  35. 35.Which is closest to 3997 ÷ 49? (a) 160 (b) 800 (c) 80 (d) 40
  36. 36.Which is closest to 2091 ÷ 29? (a) 700 (b) 35 (c) 70 (d) 140
  37. 37.Round 12672 to the nearest hundred.
  38. 38.Round 16.91 to one decimal place. =
  39. 39.Round 24.94 to one decimal place. =
  40. 40.Which is closest to 2694 ÷ 29? (a) 180 (b) 90 (c) 900 (d) 45

Answer key

  1. 50
  2. 12.7
  3. 1300
  4. 63000
  5. 35000
  6. 1200
  7. 49200
  8. 95.9
  9. 48000
  10. 16000
  11. 12000
  12. 20
  13. 1300
  14. 24000
  15. 60
  16. 46.3
  17. 12000
  18. 45000
  19. 19.3
  20. 18000
  21. 60
  22. 6000
  23. 70
  24. 20
  25. 66970
  26. 40
  27. 12000
  28. 40000
  29. 1200
  30. 1400
  31. 27000
  32. 16.7
  33. 60
  34. 300
  35. 80
  36. 70
  37. 12700
  38. 16.9
  39. 24.9
  40. 90

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