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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 323 · 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 899 × 58? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  2. 2.Which is closest to 897 × 70? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  3. 3.Round 51130 to the nearest hundred.
  4. 4.Round 76295 to the nearest hundred.
  5. 5.Which is closest to 298 + 903 + 97? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  6. 6.Which is closest to 593 ÷ 19? (a) 60 (b) 15 (c) 30 (d) 300
  7. 7.Round 45.32 to one decimal place. =
  8. 8.Round 40452 to the nearest thousand.
  9. 9.Round 62143 to the nearest hundred.
  10. 10.Round 46711 to the nearest hundred.
  11. 11.Which is closest to 105 + 204 + 98? (a) 600 (b) 400 (c) 300 (d) 500
  12. 12.Round 38.36 to one decimal place. =
  13. 13.Round 22651 to the nearest thousand.
  14. 14.Which is closest to 600 × 28? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  15. 15.Round 14.29 to one decimal place. =
  16. 16.Which is closest to 2101 ÷ 31? (a) 140 (b) 700 (c) 35 (d) 70
  17. 17.Which is closest to 200 + 295 + 104? (a) 500 (b) 600 (c) 800 (d) 700
  18. 18.Round 53978 to the nearest thousand.
  19. 19.Which is closest to 203 + 798 + 605? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  20. 20.Which is closest to 696 × 59? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  21. 21.Which is closest to 2492 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  22. 22.Round 57.74 to one decimal place. =
  23. 23.Which is closest to 802 + 399 + 102? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  24. 24.Round 71.28 to one decimal place. =
  25. 25.Round 58301 to the nearest hundred.
  26. 26.Which is closest to 1001 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  27. 27.Which is closest to 892 ÷ 29? (a) 30 (b) 15 (c) 60 (d) 300
  28. 28.Round 16.42 to one decimal place. =
  29. 29.Round 99.63 to one decimal place. =
  30. 30.Which is closest to 604 ÷ 31? (a) 10 (b) 200 (c) 40 (d) 20
  31. 31.Which is closest to 896 × 62? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  32. 32.Which is closest to 701 × 69? (Round each number first.) (a) 490000 (b) 49000 (c) 4900 (d) 98000
  33. 33.Round 81.83 to one decimal place. =
  34. 34.Which is closest to 296 × 92? (Round each number first.) (a) 27000 (b) 270000 (c) 2700 (d) 54000
  35. 35.Round 90281 to the nearest ten.
  36. 36.Round 31.34 to one decimal place. =
  37. 37.Round 42.23 to one decimal place. =
  38. 38.Round 51.91 to one decimal place. =
  39. 39.Which is closest to 304 × 32? (Round each number first.) (a) 90000 (b) 900 (c) 18000 (d) 9000
  40. 40.Round 26143 to the nearest thousand.

Answer key

  1. 54000
  2. 63000
  3. 51100
  4. 76300
  5. 1300
  6. 30
  7. 45.3
  8. 40000
  9. 62100
  10. 46700
  11. 400
  12. 38.4
  13. 23000
  14. 18000
  15. 14.3
  16. 70
  17. 600
  18. 54000
  19. 1600
  20. 42000
  21. 50
  22. 57.7
  23. 1300
  24. 71.3
  25. 58300
  26. 20
  27. 30
  28. 16.4
  29. 99.6
  30. 20
  31. 54000
  32. 49000
  33. 81.8
  34. 27000
  35. 90280
  36. 31.3
  37. 42.2
  38. 51.9
  39. 9000
  40. 26000

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