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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 190 · 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 701 + 902 + 495? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  2. 2.Which is closest to 296 + 895 + 799? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  3. 3.Which is closest to 197 + 205 + 504? (a) 1000 (b) 1100 (c) 800 (d) 900
  4. 4.Which is closest to 603 + 300 + 901? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  5. 5.Which is closest to 698 × 21? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  6. 6.Which is closest to 704 × 42? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  7. 7.Round 56439 to the nearest ten.
  8. 8.Which is closest to 96 + 903 + 597? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  9. 9.Which is closest to 905 + 899 + 598? (a) 2500 (b) 2400 (c) 2300 (d) 2600
  10. 10.Round 75973 to the nearest ten.
  11. 11.Which is closest to 1805 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  12. 12.Round 94.59 to one decimal place. =
  13. 13.Round 81668 to the nearest thousand.
  14. 14.Which is closest to 401 × 58? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  15. 15.Round 52841 to the nearest ten.
  16. 16.Round 11548 to the nearest hundred.
  17. 17.Which is closest to 196 × 30? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
  18. 18.Round 11.76 to one decimal place. =
  19. 19.Round 73693 to the nearest ten.
  20. 20.Which is closest to 703 + 699 + 504? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  21. 21.Which is closest to 898 + 503 + 901? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  22. 22.Round 27.19 to one decimal place. =
  23. 23.Round 91.26 to one decimal place. =
  24. 24.Which is closest to 3608 ÷ 39? (a) 90 (b) 180 (c) 900 (d) 45
  25. 25.Which is closest to 504 × 62? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  26. 26.Round 41.71 to one decimal place. =
  27. 27.Round 93562 to the nearest hundred.
  28. 28.Which is closest to 98 + 396 + 595? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  29. 29.Which is closest to 596 × 21? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  30. 30.Which is closest to 201 × 42? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  31. 31.Which is closest to 402 × 31? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  32. 32.Which is closest to 3994 ÷ 49? (a) 40 (b) 80 (c) 160 (d) 800
  33. 33.Which is closest to 698 × 49? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  34. 34.Round 39528 to the nearest hundred.
  35. 35.Which is closest to 197 × 40? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  36. 36.Round 16879 to the nearest thousand.
  37. 37.Which is closest to 904 + 703 + 701? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  38. 38.Which is closest to 200 + 303 + 396? (a) 1100 (b) 1000 (c) 900 (d) 800
  39. 39.Which is closest to 898 + 400 + 900? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  40. 40.Round 11147 to the nearest hundred.

Answer key

  1. 2100
  2. 2000
  3. 900
  4. 1800
  5. 14000
  6. 28000
  7. 56440
  8. 1600
  9. 2400
  10. 75970
  11. 60
  12. 94.6
  13. 82000
  14. 24000
  15. 52840
  16. 11500
  17. 6000
  18. 11.8
  19. 73690
  20. 1900
  21. 2300
  22. 27.2
  23. 91.3
  24. 90
  25. 30000
  26. 41.7
  27. 93600
  28. 1100
  29. 12000
  30. 8000
  31. 12000
  32. 80
  33. 35000
  34. 39500
  35. 8000
  36. 17000
  37. 2300
  38. 900
  39. 2200
  40. 11100

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