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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 202 · 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 596 × 88? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  2. 2.Round 95.61 to one decimal place. =
  3. 3.Which is closest to 301 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  4. 4.Which is closest to 605 + 595 + 297? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  5. 5.Which is closest to 399 × 48? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  6. 6.Which is closest to 903 × 59? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  7. 7.Which is closest to 608 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  8. 8.Which is closest to 300 × 91? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  9. 9.Which is closest to 700 + 195 + 697? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  10. 10.Which is closest to 903 × 38? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  11. 11.Which is closest to 498 × 40? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
  12. 12.Round 99.68 to one decimal place. =
  13. 13.Round 67.74 to one decimal place. =
  14. 14.Round 7756 to the nearest hundred.
  15. 15.Which is closest to 697 + 597 + 695? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  16. 16.Which is closest to 898 + 204 + 604? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  17. 17.Round 43.79 to one decimal place. =
  18. 18.Round 37603 to the nearest thousand.
  19. 19.Which is closest to 403 × 69? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  20. 20.Round 77.63 to one decimal place. =
  21. 21.Which is closest to 297 × 19? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  22. 22.Round 6123 to the nearest hundred.
  23. 23.Round 49185 to the nearest hundred.
  24. 24.Round 61.21 to one decimal place. =
  25. 25.Round 46442 to the nearest thousand.
  26. 26.Which is closest to 398 + 602 + 101? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  27. 27.Which is closest to 297 + 98 + 305? (a) 800 (b) 900 (c) 700 (d) 600
  28. 28.Which is closest to 603 × 92? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  29. 29.Round 68.93 to one decimal place. =
  30. 30.Round 18.21 to one decimal place. =
  31. 31.Round 99.12 to one decimal place. =
  32. 32.Which is closest to 402 × 90? (Round each number first.) (a) 360000 (b) 36000 (c) 3600 (d) 72000
  33. 33.Which is closest to 102 + 805 + 204? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  34. 34.Which is closest to 100 + 404 + 901? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  35. 35.Round 23354 to the nearest ten.
  36. 36.Round 7942 to the nearest hundred.
  37. 37.Round 15.78 to one decimal place. =
  38. 38.Which is closest to 800 × 48? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  39. 39.Which is closest to 2395 ÷ 29? (a) 40 (b) 80 (c) 800 (d) 160
  40. 40.Which is closest to 2008 ÷ 39? (a) 25 (b) 100 (c) 50 (d) 500

Answer key

  1. 54000
  2. 95.6
  3. 6000
  4. 1500
  5. 20000
  6. 54000
  7. 20
  8. 27000
  9. 1600
  10. 36000
  11. 20000
  12. 99.7
  13. 67.7
  14. 7800
  15. 2000
  16. 1700
  17. 43.8
  18. 38000
  19. 28000
  20. 77.6
  21. 6000
  22. 6100
  23. 49200
  24. 61.2
  25. 46000
  26. 1100
  27. 700
  28. 54000
  29. 68.9
  30. 18.2
  31. 99.1
  32. 36000
  33. 1100
  34. 1400
  35. 23350
  36. 7900
  37. 15.8
  38. 40000
  39. 80
  40. 50

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