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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 166 · 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 1598 ÷ 21? (a) 800 (b) 80 (c) 40 (d) 160
  2. 2.Which is closest to 596 + 297 + 504? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  3. 3.Which is closest to 700 × 31? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  4. 4.Which is closest to 704 × 88? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  5. 5.Which is closest to 696 × 19? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  6. 6.Which is closest to 996 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  7. 7.Round 34.28 to one decimal place. =
  8. 8.Which is closest to 2808 ÷ 39? (a) 70 (b) 140 (c) 35 (d) 700
  9. 9.Which is closest to 899 × 20? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  10. 10.Round 41.26 to one decimal place. =
  11. 11.Round 60041 to the nearest ten.
  12. 12.Round 56.81 to one decimal place. =
  13. 13.Round 41.51 to one decimal place. =
  14. 14.Which is closest to 1004 ÷ 51? (a) 200 (b) 10 (c) 20 (d) 40
  15. 15.Round 98.39 to one decimal place. =
  16. 16.Which is closest to 796 × 22? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  17. 17.Which is closest to 901 × 61? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  18. 18.Which is closest to 97 + 197 + 302? (a) 600 (b) 800 (c) 700 (d) 500
  19. 19.Round 93.37 to one decimal place. =
  20. 20.Which is closest to 201 × 48? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  21. 21.Which is closest to 600 + 895 + 104? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  22. 22.Which is closest to 404 × 29? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  23. 23.Which is closest to 397 × 48? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  24. 24.Round 88421 to the nearest hundred.
  25. 25.Round 56.58 to one decimal place. =
  26. 26.Round 28.33 to one decimal place. =
  27. 27.Round 40.76 to one decimal place. =
  28. 28.Which is closest to 597 × 68? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  29. 29.Round 83.71 to one decimal place. =
  30. 30.Which is closest to 4001 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  31. 31.Round 86.34 to one decimal place. =
  32. 32.Round 24139 to the nearest ten.
  33. 33.Round 40.11 to one decimal place. =
  34. 34.Which is closest to 404 × 19? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  35. 35.Round 11160 to the nearest thousand.
  36. 36.Round 21332 to the nearest ten.
  37. 37.Which is closest to 400 × 92? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  38. 38.Round 14903 to the nearest ten.
  39. 39.Round 38.06 to one decimal place. =
  40. 40.Round 74.16 to one decimal place. =

Answer key

  1. 80
  2. 1400
  3. 21000
  4. 63000
  5. 14000
  6. 20
  7. 34.3
  8. 70
  9. 18000
  10. 41.3
  11. 60040
  12. 56.8
  13. 41.5
  14. 20
  15. 98.4
  16. 16000
  17. 54000
  18. 600
  19. 93.4
  20. 10000
  21. 1600
  22. 12000
  23. 20000
  24. 88400
  25. 56.6
  26. 28.3
  27. 40.8
  28. 42000
  29. 83.7
  30. 80
  31. 86.3
  32. 24140
  33. 40.1
  34. 8000
  35. 11000
  36. 21330
  37. 36000
  38. 14900
  39. 38.1
  40. 74.2

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