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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 258 · 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 97 + 296 + 704? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  2. 2.Round 73.67 to one decimal place. =
  3. 3.Which is closest to 1802 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  4. 4.Which is closest to 501 × 78? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  5. 5.Round 95904 to the nearest hundred.
  6. 6.Which is closest to 1992 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  7. 7.Which is closest to 98 + 398 + 204? (a) 700 (b) 900 (c) 800 (d) 600
  8. 8.Which is closest to 896 × 32? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  9. 9.Round 12.41 to one decimal place. =
  10. 10.Round 48543 to the nearest ten.
  11. 11.Round 67112 to the nearest hundred.
  12. 12.Round 70178 to the nearest thousand.
  13. 13.Round 10826 to the nearest thousand.
  14. 14.Which is closest to 603 × 88? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  15. 15.Which is closest to 401 + 703 + 896? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  16. 16.Round 75680 to the nearest hundred.
  17. 17.Which is closest to 700 × 79? (Round each number first.) (a) 5600 (b) 560000 (c) 56000 (d) 112000
  18. 18.Which is closest to 898 × 21? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  19. 19.Which is closest to 595 ÷ 19? (a) 15 (b) 60 (c) 300 (d) 30
  20. 20.Round 60.88 to one decimal place. =
  21. 21.Which is closest to 1006 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  22. 22.Round 48529 to the nearest hundred.
  23. 23.Which is closest to 2007 ÷ 49? (a) 80 (b) 20 (c) 400 (d) 40
  24. 24.Which is closest to 1792 ÷ 21? (a) 45 (b) 90 (c) 180 (d) 900
  25. 25.Which is closest to 599 × 21? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  26. 26.Which is closest to 1605 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  27. 27.Which is closest to 804 × 18? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  28. 28.Which is closest to 105 + 897 + 600? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  29. 29.Which is closest to 498 × 62? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  30. 30.Round 95851 to the nearest hundred.
  31. 31.Round 69867 to the nearest ten.
  32. 32.Round 81.53 to one decimal place. =
  33. 33.Which is closest to 799 × 71? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  34. 34.Round 44.86 to one decimal place. =
  35. 35.Round 91715 to the nearest thousand.
  36. 36.Round 33027 to the nearest hundred.
  37. 37.Round 83.67 to one decimal place. =
  38. 38.Which is closest to 1593 ÷ 21? (a) 40 (b) 800 (c) 160 (d) 80
  39. 39.Which is closest to 601 + 601 + 102? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  40. 40.Which is closest to 2398 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800

Answer key

  1. 1100
  2. 73.7
  3. 60
  4. 40000
  5. 95900
  6. 50
  7. 700
  8. 27000
  9. 12.4
  10. 48540
  11. 67100
  12. 70000
  13. 11000
  14. 54000
  15. 2000
  16. 75700
  17. 56000
  18. 18000
  19. 30
  20. 60.9
  21. 20
  22. 48500
  23. 40
  24. 90
  25. 12000
  26. 40
  27. 16000
  28. 1600
  29. 30000
  30. 95900
  31. 69870
  32. 81.5
  33. 56000
  34. 44.9
  35. 92000
  36. 33000
  37. 83.7
  38. 80
  39. 1300
  40. 80

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