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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 405 · 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 86.68 to one decimal place. =
  2. 2.Which is closest to 201 × 42? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  3. 3.Round 48.26 to one decimal place. =
  4. 4.Round 23.09 to one decimal place. =
  5. 5.Round 47.57 to one decimal place. =
  6. 6.Which is closest to 1192 ÷ 29? (a) 40 (b) 400 (c) 20 (d) 80
  7. 7.Round 22.82 to one decimal place. =
  8. 8.Which is closest to 893 ÷ 31? (a) 60 (b) 15 (c) 300 (d) 30
  9. 9.Which is closest to 198 × 70? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  10. 10.Which is closest to 305 + 897 + 195? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  11. 11.Which is closest to 791 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  12. 12.Round 40084 to the nearest thousand.
  13. 13.Round 88.08 to one decimal place. =
  14. 14.Round 50.71 to one decimal place. =
  15. 15.Which is closest to 903 × 88? (Round each number first.) (a) 162000 (b) 8100 (c) 810000 (d) 81000
  16. 16.Round 94424 to the nearest hundred.
  17. 17.Round 57.59 to one decimal place. =
  18. 18.Which is closest to 96 + 105 + 300? (a) 600 (b) 700 (c) 400 (d) 500
  19. 19.Round 85667 to the nearest ten.
  20. 20.Round 2565 to the nearest hundred.
  21. 21.Which is closest to 602 + 905 + 498? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  22. 22.Which is closest to 302 × 72? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  23. 23.Round 84585 to the nearest hundred.
  24. 24.Round 8214 to the nearest ten.
  25. 25.Round 67.39 to one decimal place. =
  26. 26.Which is closest to 201 + 797 + 398? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  27. 27.Round 87.12 to one decimal place. =
  28. 28.Round 64.63 to one decimal place. =
  29. 29.Which is closest to 399 × 40? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  30. 30.Which is closest to 902 × 38? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  31. 31.Which is closest to 2399 ÷ 39? (a) 30 (b) 60 (c) 600 (d) 120
  32. 32.Which is closest to 1799 ÷ 21? (a) 180 (b) 45 (c) 90 (d) 900
  33. 33.Which is closest to 804 ÷ 41? (a) 10 (b) 200 (c) 20 (d) 40
  34. 34.Which is closest to 396 + 95 + 201? (a) 600 (b) 700 (c) 800 (d) 900
  35. 35.Which is closest to 902 × 20? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  36. 36.Which is closest to 1799 ÷ 19? (a) 180 (b) 90 (c) 900 (d) 45
  37. 37.Which is closest to 504 × 49? (Round each number first.) (a) 50000 (b) 250000 (c) 25000 (d) 2500
  38. 38.Which is closest to 598 × 59? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  39. 39.Which is closest to 199 × 29? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  40. 40.Which is closest to 297 × 40? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000

Answer key

  1. 86.7
  2. 8000
  3. 48.3
  4. 23.1
  5. 47.6
  6. 40
  7. 22.8
  8. 30
  9. 14000
  10. 1400
  11. 20
  12. 40000
  13. 88.1
  14. 50.7
  15. 81000
  16. 94400
  17. 57.6
  18. 500
  19. 85670
  20. 2600
  21. 2000
  22. 21000
  23. 84600
  24. 8210
  25. 67.4
  26. 1400
  27. 87.1
  28. 64.6
  29. 16000
  30. 36000
  31. 60
  32. 90
  33. 20
  34. 700
  35. 18000
  36. 90
  37. 25000
  38. 36000
  39. 6000
  40. 12000

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