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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 638 · 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 1802 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  2. 2.Round 81.78 to one decimal place. =
  3. 3.Round 15.24 to one decimal place. =
  4. 4.Round 42722 to the nearest ten.
  5. 5.Which is closest to 97 + 905 + 203? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  6. 6.Which is closest to 597 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  7. 7.Round 40.23 to one decimal place. =
  8. 8.Round 65428 to the nearest hundred.
  9. 9.Round 59.48 to one decimal place. =
  10. 10.Round 17.66 to one decimal place. =
  11. 11.Round 75.39 to one decimal place. =
  12. 12.Round 28.43 to one decimal place. =
  13. 13.Which is closest to 705 + 502 + 295? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  14. 14.Which is closest to 2007 ÷ 39? (a) 25 (b) 100 (c) 50 (d) 500
  15. 15.Round 38.16 to one decimal place. =
  16. 16.Which is closest to 496 × 49? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000
  17. 17.Which is closest to 601 × 29? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  18. 18.Round 54.13 to one decimal place. =
  19. 19.Which is closest to 899 × 19? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  20. 20.Round 19.32 to one decimal place. =
  21. 21.Which is closest to 1506 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  22. 22.Round 15804 to the nearest ten.
  23. 23.Round 48.77 to one decimal place. =
  24. 24.Which is closest to 2006 ÷ 51? (a) 400 (b) 40 (c) 80 (d) 20
  25. 25.Round 20510 to the nearest thousand.
  26. 26.Which is closest to 2103 ÷ 31? (a) 35 (b) 700 (c) 70 (d) 140
  27. 27.Which is closest to 804 + 103 + 700? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  28. 28.Which is closest to 497 + 195 + 903? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  29. 29.Which is closest to 296 × 62? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  30. 30.Which is closest to 594 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  31. 31.Which is closest to 599 × 89? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  32. 32.Round 18.66 to one decimal place. =
  33. 33.Round 65080 to the nearest thousand.
  34. 34.Round 8006 to the nearest thousand.
  35. 35.Which is closest to 1201 ÷ 41? (a) 300 (b) 60 (c) 15 (d) 30
  36. 36.Round 94.87 to one decimal place. =
  37. 37.Round 42.59 to one decimal place. =
  38. 38.Round 43.58 to one decimal place. =
  39. 39.Which is closest to 402 + 604 + 105? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  40. 40.Which is closest to 609 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20

Answer key

  1. 60
  2. 81.8
  3. 15.2
  4. 42720
  5. 1200
  6. 42000
  7. 40.2
  8. 65400
  9. 59.5
  10. 17.7
  11. 75.4
  12. 28.4
  13. 1500
  14. 50
  15. 38.2
  16. 25000
  17. 18000
  18. 54.1
  19. 18000
  20. 19.3
  21. 50
  22. 15800
  23. 48.8
  24. 40
  25. 21000
  26. 70
  27. 1600
  28. 1600
  29. 18000
  30. 20
  31. 54000
  32. 18.7
  33. 65000
  34. 8000
  35. 30
  36. 94.9
  37. 42.6
  38. 43.6
  39. 1100
  40. 20

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