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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 651 · 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 797 × 89? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
  2. 2.Which is closest to 991 ÷ 19? (a) 100 (b) 50 (c) 25 (d) 500
  3. 3.Round 11934 to the nearest ten.
  4. 4.Round 99.78 to one decimal place. =
  5. 5.Which is closest to 301 × 68? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  6. 6.Which is closest to 602 + 698 + 102? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  7. 7.Which is closest to 3197 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  8. 8.Round 54041 to the nearest hundred.
  9. 9.Round 33.46 to one decimal place. =
  10. 10.Which is closest to 401 × 19? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  11. 11.Which is closest to 504 × 68? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  12. 12.Which is closest to 96 + 505 + 101? (a) 900 (b) 600 (c) 800 (d) 700
  13. 13.Which is closest to 2807 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  14. 14.Which is closest to 1401 ÷ 21? (a) 700 (b) 35 (c) 70 (d) 140
  15. 15.Which is closest to 608 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  16. 16.Which is closest to 1395 ÷ 21? (a) 35 (b) 140 (c) 700 (d) 70
  17. 17.Which is closest to 1496 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  18. 18.Round 98.69 to one decimal place. =
  19. 19.Which is closest to 502 × 69? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  20. 20.Which is closest to 2402 ÷ 39? (a) 30 (b) 120 (c) 60 (d) 600
  21. 21.Which is closest to 3995 ÷ 49? (a) 80 (b) 40 (c) 800 (d) 160
  22. 22.Round 64704 to the nearest thousand.
  23. 23.Round 58.58 to one decimal place. =
  24. 24.Round 91938 to the nearest hundred.
  25. 25.Which is closest to 304 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  26. 26.Which is closest to 396 × 41? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  27. 27.Which is closest to 2804 ÷ 41? (a) 70 (b) 140 (c) 700 (d) 35
  28. 28.Round 53288 to the nearest thousand.
  29. 29.Which is closest to 598 × 92? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  30. 30.Round 34699 to the nearest ten.
  31. 31.Which is closest to 501 × 69? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  32. 32.Round 53.49 to one decimal place. =
  33. 33.Which is closest to 595 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  34. 34.Which is closest to 603 × 30? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  35. 35.Round 88567 to the nearest hundred.
  36. 36.Which is closest to 598 + 405 + 501? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  37. 37.Round 29904 to the nearest hundred.
  38. 38.Which is closest to 501 × 82? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  39. 39.Which is closest to 697 + 799 + 899? (a) 2600 (b) 2300 (c) 2500 (d) 2400
  40. 40.Which is closest to 1608 ÷ 21? (a) 80 (b) 160 (c) 800 (d) 40

Answer key

  1. 72000
  2. 50
  3. 11930
  4. 99.8
  5. 21000
  6. 1400
  7. 80
  8. 54000
  9. 33.5
  10. 8000
  11. 35000
  12. 700
  13. 70
  14. 70
  15. 20
  16. 70
  17. 30
  18. 98.7
  19. 35000
  20. 60
  21. 80
  22. 65000
  23. 58.6
  24. 91900
  25. 6000
  26. 16000
  27. 70
  28. 53000
  29. 54000
  30. 34700
  31. 35000
  32. 53.5
  33. 30
  34. 18000
  35. 88600
  36. 1500
  37. 29900
  38. 40000
  39. 2400
  40. 80

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