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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 13 · 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.Round 78.42 to one decimal place. =
  2. 2.Which is closest to 297 + 705 + 103? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  3. 3.Round 50.93 to one decimal place. =
  4. 4.Which is closest to 898 × 31? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  5. 5.Which is closest to 3994 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  6. 6.Round 68.52 to one decimal place. =
  7. 7.Round 83.62 to one decimal place. =
  8. 8.Which is closest to 198 + 203 + 197? (a) 700 (b) 500 (c) 600 (d) 800
  9. 9.Round 32667 to the nearest thousand.
  10. 10.Which is closest to 1409 ÷ 21? (a) 140 (b) 35 (c) 70 (d) 700
  11. 11.Which is closest to 704 × 42? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  12. 12.Round 26.24 to one decimal place. =
  13. 13.Which is closest to 99 + 196 + 798? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  14. 14.Which is closest to 795 + 95 + 296? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  15. 15.Round 95787 to the nearest hundred.
  16. 16.Which is closest to 404 + 505 + 202? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  17. 17.Which is closest to 199 × 39? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  18. 18.Round 87039 to the nearest hundred.
  19. 19.Which is closest to 103 + 103 + 801? (a) 1000 (b) 1200 (c) 900 (d) 1100
  20. 20.Round 30.07 to one decimal place. =
  21. 21.Which is closest to 601 × 39? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  22. 22.Which is closest to 401 × 39? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  23. 23.Round 72.79 to one decimal place. =
  24. 24.Round 45412 to the nearest hundred.
  25. 25.Which is closest to 297 × 89? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  26. 26.Round 19634 to the nearest hundred.
  27. 27.Which is closest to 395 + 497 + 398? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  28. 28.Round 54886 to the nearest hundred.
  29. 29.Which is closest to 705 + 200 + 98? (a) 900 (b) 1000 (c) 1200 (d) 1100
  30. 30.Round 40273 to the nearest thousand.
  31. 31.Which is closest to 802 × 92? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  32. 32.Which is closest to 102 + 798 + 204? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  33. 33.Which is closest to 2392 ÷ 31? (a) 40 (b) 800 (c) 80 (d) 160
  34. 34.Which is closest to 103 + 904 + 596? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  35. 35.Round 48296 to the nearest hundred.
  36. 36.Round 43.93 to one decimal place. =
  37. 37.Which is closest to 1491 ÷ 31? (a) 100 (b) 500 (c) 25 (d) 50
  38. 38.Which is closest to 302 + 399 + 898? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  39. 39.Which is closest to 601 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  40. 40.Which is closest to 3592 ÷ 41? (a) 900 (b) 90 (c) 45 (d) 180

Answer key

  1. 78.4
  2. 1100
  3. 50.9
  4. 27000
  5. 80
  6. 68.5
  7. 83.6
  8. 600
  9. 33000
  10. 70
  11. 28000
  12. 26.2
  13. 1100
  14. 1200
  15. 95800
  16. 1100
  17. 8000
  18. 87000
  19. 1000
  20. 30.1
  21. 24000
  22. 16000
  23. 72.8
  24. 45400
  25. 27000
  26. 19600
  27. 1300
  28. 54900
  29. 1000
  30. 40000
  31. 72000
  32. 1100
  33. 80
  34. 1600
  35. 48300
  36. 43.9
  37. 50
  38. 1600
  39. 20
  40. 90

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