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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 77 · 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 503 + 602 + 498? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  2. 2.Round 11.32 to one decimal place. =
  3. 3.Round 71.81 to one decimal place. =
  4. 4.Which is closest to 304 × 89? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  5. 5.Round 74213 to the nearest thousand.
  6. 6.Round 10019 to the nearest hundred.
  7. 7.Which is closest to 201 × 38? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  8. 8.Which is closest to 704 × 50? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  9. 9.Which is closest to 297 + 595 + 705? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  10. 10.Which is closest to 3992 ÷ 51? (a) 800 (b) 80 (c) 160 (d) 40
  11. 11.Which is closest to 1794 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  12. 12.Round 84.44 to one decimal place. =
  13. 13.Which is closest to 603 + 805 + 803? (a) 2200 (b) 2300 (c) 2100 (d) 2400
  14. 14.Which is closest to 1796 ÷ 31? (a) 120 (b) 600 (c) 30 (d) 60
  15. 15.Which is closest to 1605 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  16. 16.Which is closest to 196 × 78? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  17. 17.Round 39.54 to one decimal place. =
  18. 18.Which is closest to 196 × 92? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  19. 19.Which is closest to 703 × 30? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  20. 20.Round 97595 to the nearest thousand.
  21. 21.Which is closest to 96 + 97 + 100? (a) 200 (b) 300 (c) 500 (d) 400
  22. 22.Round 30891 to the nearest thousand.
  23. 23.Which is closest to 1191 ÷ 41? (a) 60 (b) 300 (c) 30 (d) 15
  24. 24.Which is closest to 1004 ÷ 19? (a) 25 (b) 50 (c) 500 (d) 100
  25. 25.Round 73.33 to one decimal place. =
  26. 26.Which is closest to 398 + 797 + 398? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  27. 27.Round 10.14 to one decimal place. =
  28. 28.Which is closest to 1495 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
  29. 29.Which is closest to 96 + 600 + 300? (a) 1100 (b) 900 (c) 1000 (d) 1200
  30. 30.Which is closest to 503 × 20? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  31. 31.Round 12421 to the nearest ten.
  32. 32.Round 96.29 to one decimal place. =
  33. 33.Which is closest to 197 × 90? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  34. 34.Round 91.36 to one decimal place. =
  35. 35.Which is closest to 604 + 896 + 798? (a) 2400 (b) 2200 (c) 2300 (d) 2500
  36. 36.Round 86.79 to one decimal place. =
  37. 37.Which is closest to 696 × 28? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  38. 38.Round 10425 to the nearest thousand.
  39. 39.Which is closest to 1008 ÷ 21? (a) 100 (b) 500 (c) 25 (d) 50
  40. 40.Which is closest to 901 × 88? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000

Answer key

  1. 1600
  2. 11.3
  3. 71.8
  4. 27000
  5. 74000
  6. 10000
  7. 8000
  8. 35000
  9. 1600
  10. 80
  11. 60
  12. 84.4
  13. 2200
  14. 60
  15. 40
  16. 16000
  17. 39.5
  18. 18000
  19. 21000
  20. 98000
  21. 300
  22. 31000
  23. 30
  24. 50
  25. 73.3
  26. 1600
  27. 10.1
  28. 30
  29. 1000
  30. 10000
  31. 12420
  32. 96.3
  33. 18000
  34. 91.4
  35. 2300
  36. 86.8
  37. 21000
  38. 10000
  39. 50
  40. 81000

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