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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 12 · 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 696 × 80? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  2. 2.Which is closest to 98 + 796 + 699? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  3. 3.Round 27.09 to one decimal place. =
  4. 4.Which is closest to 198 + 399 + 896? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  5. 5.Which is closest to 597 + 699 + 705? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  6. 6.Round 45323 to the nearest ten.
  7. 7.Round 91.43 to one decimal place. =
  8. 8.Round 47087 to the nearest thousand.
  9. 9.Round 38.32 to one decimal place. =
  10. 10.Which is closest to 404 × 72? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  11. 11.Round 32.54 to one decimal place. =
  12. 12.Which is closest to 794 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  13. 13.Which is closest to 4502 ÷ 51? (a) 90 (b) 45 (c) 180 (d) 900
  14. 14.Which is closest to 696 × 30? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  15. 15.Which is closest to 703 × 78? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  16. 16.Which is closest to 203 + 400 + 397? (a) 1000 (b) 900 (c) 1200 (d) 1100
  17. 17.Which is closest to 304 × 79? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  18. 18.Round 86031 to the nearest ten.
  19. 19.Round 76.17 to one decimal place. =
  20. 20.Which is closest to 1591 ÷ 21? (a) 80 (b) 800 (c) 160 (d) 40
  21. 21.Round 81275 to the nearest thousand.
  22. 22.Round 82123 to the nearest thousand.
  23. 23.Which is closest to 597 × 90? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  24. 24.Round 40.73 to one decimal place. =
  25. 25.Which is closest to 592 ÷ 31? (a) 20 (b) 200 (c) 40 (d) 10
  26. 26.Which is closest to 1496 ÷ 49? (a) 60 (b) 30 (c) 300 (d) 15
  27. 27.Which is closest to 1792 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  28. 28.Which is closest to 897 + 295 + 603? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  29. 29.Round 28.78 to one decimal place. =
  30. 30.Round 36.39 to one decimal place. =
  31. 31.Round 64596 to the nearest ten.
  32. 32.Round 34.42 to one decimal place. =
  33. 33.Which is closest to 1401 ÷ 19? (a) 35 (b) 140 (c) 700 (d) 70
  34. 34.Round 22.82 to one decimal place. =
  35. 35.Which is closest to 603 × 40? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  36. 36.Which is closest to 1500 ÷ 29? (a) 500 (b) 50 (c) 100 (d) 25
  37. 37.Round 50.89 to one decimal place. =
  38. 38.Which is closest to 2399 ÷ 39? (a) 60 (b) 600 (c) 120 (d) 30
  39. 39.Round 34.44 to one decimal place. =
  40. 40.Which is closest to 1006 ÷ 19? (a) 500 (b) 100 (c) 50 (d) 25

Answer key

  1. 56000
  2. 1600
  3. 27.1
  4. 1500
  5. 2000
  6. 45320
  7. 91.4
  8. 47000
  9. 38.3
  10. 28000
  11. 32.5
  12. 40
  13. 90
  14. 21000
  15. 56000
  16. 1000
  17. 24000
  18. 86030
  19. 76.2
  20. 80
  21. 81000
  22. 82000
  23. 54000
  24. 40.7
  25. 20
  26. 30
  27. 60
  28. 1800
  29. 28.8
  30. 36.4
  31. 64600
  32. 34.4
  33. 70
  34. 22.8
  35. 24000
  36. 50
  37. 50.9
  38. 60
  39. 34.4
  40. 50

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