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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 524 · 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 80.42 to one decimal place. =
  2. 2.Which is closest to 197 + 604 + 695? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  3. 3.Which is closest to 199 + 102 + 103? (a) 500 (b) 600 (c) 300 (d) 400
  4. 4.Which is closest to 700 × 68? (Round each number first.) (a) 49000 (b) 490000 (c) 4900 (d) 98000
  5. 5.Which is closest to 496 × 29? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  6. 6.Round 84036 to the nearest thousand.
  7. 7.Which is closest to 1596 ÷ 21? (a) 80 (b) 800 (c) 40 (d) 160
  8. 8.Round 32.31 to one decimal place. =
  9. 9.Which is closest to 703 × 78? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  10. 10.Which is closest to 1796 ÷ 21? (a) 900 (b) 45 (c) 180 (d) 90
  11. 11.Which is closest to 699 × 49? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  12. 12.Which is closest to 897 + 203 + 197? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  13. 13.Which is closest to 2797 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  14. 14.Round 74476 to the nearest ten.
  15. 15.Which is closest to 899 × 72? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  16. 16.Round 90.48 to one decimal place. =
  17. 17.Round 94138 to the nearest thousand.
  18. 18.Which is closest to 1196 ÷ 31? (a) 20 (b) 40 (c) 80 (d) 400
  19. 19.Which is closest to 197 × 79? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  20. 20.Round 33.39 to one decimal place. =
  21. 21.Which is closest to 201 + 301 + 300? (a) 1000 (b) 700 (c) 900 (d) 800
  22. 22.Round 25.48 to one decimal place. =
  23. 23.Which is closest to 596 + 203 + 902? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  24. 24.Round 12.51 to one decimal place. =
  25. 25.Round 12340 to the nearest thousand.
  26. 26.Round 71.29 to one decimal place. =
  27. 27.Which is closest to 3994 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  28. 28.Which is closest to 503 × 22? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  29. 29.Which is closest to 303 × 51? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  30. 30.Round 55282 to the nearest thousand.
  31. 31.Which is closest to 200 + 301 + 698? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  32. 32.Which is closest to 704 × 50? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  33. 33.Round 3102 to the nearest thousand.
  34. 34.Which is closest to 1001 ÷ 19? (a) 100 (b) 50 (c) 25 (d) 500
  35. 35.Round 10.16 to one decimal place. =
  36. 36.Round 10456 to the nearest thousand.
  37. 37.Round 19969 to the nearest thousand.
  38. 38.Which is closest to 599 × 71? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  39. 39.Which is closest to 304 × 19? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  40. 40.Which is closest to 1593 ÷ 39? (a) 400 (b) 40 (c) 20 (d) 80

Answer key

  1. 80.4
  2. 1500
  3. 400
  4. 49000
  5. 15000
  6. 84000
  7. 80
  8. 32.3
  9. 56000
  10. 90
  11. 35000
  12. 1300
  13. 70
  14. 74480
  15. 63000
  16. 90.5
  17. 94000
  18. 40
  19. 16000
  20. 33.4
  21. 800
  22. 25.5
  23. 1700
  24. 12.5
  25. 12000
  26. 71.3
  27. 80
  28. 10000
  29. 15000
  30. 55000
  31. 1200
  32. 35000
  33. 3000
  34. 50
  35. 10.2
  36. 10000
  37. 20000
  38. 42000
  39. 6000
  40. 40

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