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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 220 · 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.Round 59827 to the nearest ten.
  2. 2.Round 45.41 to one decimal place. =
  3. 3.Round 64.93 to one decimal place. =
  4. 4.Which is closest to 504 × 91? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  5. 5.Which is closest to 3009 ÷ 51? (a) 600 (b) 30 (c) 120 (d) 60
  6. 6.Which is closest to 602 + 104 + 502? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  7. 7.Round 55887 to the nearest hundred.
  8. 8.Which is closest to 203 × 90? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  9. 9.Which is closest to 297 × 48? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  10. 10.Which is closest to 401 + 901 + 797? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  11. 11.Round 22.93 to one decimal place. =
  12. 12.Which is closest to 296 + 802 + 496? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  13. 13.Round 71.91 to one decimal place. =
  14. 14.Which is closest to 795 ÷ 21? (a) 20 (b) 400 (c) 80 (d) 40
  15. 15.Which is closest to 602 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  16. 16.Round 72.37 to one decimal place. =
  17. 17.Round 50.38 to one decimal place. =
  18. 18.Which is closest to 596 ÷ 29? (a) 10 (b) 20 (c) 200 (d) 40
  19. 19.Round 41.91 to one decimal place. =
  20. 20.Round 73.24 to one decimal place. =
  21. 21.Which is closest to 797 × 29? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  22. 22.Round 22.12 to one decimal place. =
  23. 23.Round 62.89 to one decimal place. =
  24. 24.Which is closest to 403 ÷ 19? (a) 20 (b) 10 (c) 200 (d) 40
  25. 25.Which is closest to 898 × 82? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  26. 26.Round 89.67 to one decimal place. =
  27. 27.Round 33.16 to one decimal place. =
  28. 28.Which is closest to 201 × 52? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  29. 29.Round 97555 to the nearest hundred.
  30. 30.Which is closest to 2096 ÷ 31? (a) 35 (b) 140 (c) 700 (d) 70
  31. 31.Which is closest to 397 × 52? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  32. 32.Which is closest to 596 × 50? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  33. 33.Which is closest to 1805 ÷ 21? (a) 900 (b) 90 (c) 45 (d) 180
  34. 34.Which is closest to 603 + 204 + 96? (a) 800 (b) 1000 (c) 1100 (d) 900
  35. 35.Round 51.39 to one decimal place. =
  36. 36.Round 79.91 to one decimal place. =
  37. 37.Which is closest to 1207 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60
  38. 38.Round 31.44 to one decimal place. =
  39. 39.Which is closest to 602 × 49? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  40. 40.Which is closest to 903 + 795 + 299? (a) 2000 (b) 2200 (c) 1900 (d) 2100

Answer key

  1. 59830
  2. 45.4
  3. 64.9
  4. 45000
  5. 60
  6. 1200
  7. 55900
  8. 18000
  9. 15000
  10. 2100
  11. 22.9
  12. 1600
  13. 71.9
  14. 40
  15. 18000
  16. 72.4
  17. 50.4
  18. 20
  19. 41.9
  20. 73.2
  21. 24000
  22. 22.1
  23. 62.9
  24. 20
  25. 72000
  26. 89.7
  27. 33.2
  28. 10000
  29. 97600
  30. 70
  31. 20000
  32. 30000
  33. 90
  34. 900
  35. 51.4
  36. 79.9
  37. 60
  38. 31.4
  39. 30000
  40. 2000

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