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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 710 · 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 607 ÷ 19? (a) 15 (b) 300 (c) 30 (d) 60
  2. 2.Round 14.06 to one decimal place. =
  3. 3.Which is closest to 901 × 72? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  4. 4.Round 14955 to the nearest thousand.
  5. 5.Round 30.56 to one decimal place. =
  6. 6.Round 71.24 to one decimal place. =
  7. 7.Which is closest to 591 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  8. 8.Which is closest to 1002 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  9. 9.Which is closest to 797 × 52? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  10. 10.Round 3823 to the nearest thousand.
  11. 11.Which is closest to 603 + 697 + 396? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  12. 12.Which is closest to 594 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  13. 13.Which is closest to 599 ÷ 19? (a) 15 (b) 300 (c) 30 (d) 60
  14. 14.Round 69300 to the nearest thousand.
  15. 15.Round 22.77 to one decimal place. =
  16. 16.Which is closest to 802 + 302 + 195? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  17. 17.Round 76943 to the nearest thousand.
  18. 18.Which is closest to 497 + 704 + 504? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  19. 19.Which is closest to 903 × 88? (Round each number first.) (a) 8100 (b) 810000 (c) 162000 (d) 81000
  20. 20.Round 73938 to the nearest thousand.
  21. 21.Which is closest to 2396 ÷ 29? (a) 160 (b) 800 (c) 80 (d) 40
  22. 22.Round 18.72 to one decimal place. =
  23. 23.Round 25.58 to one decimal place. =
  24. 24.Round 11.32 to one decimal place. =
  25. 25.Round 22528 to the nearest hundred.
  26. 26.Round 21.44 to one decimal place. =
  27. 27.Round 3177 to the nearest ten.
  28. 28.Which is closest to 401 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  29. 29.Round 93.38 to one decimal place. =
  30. 30.Round 74.73 to one decimal place. =
  31. 31.Round 35.24 to one decimal place. =
  32. 32.Which is closest to 598 × 59? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  33. 33.Which is closest to 504 × 42? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  34. 34.Which is closest to 602 × 92? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  35. 35.Which is closest to 1206 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  36. 36.Round 94.36 to one decimal place. =
  37. 37.Round 7864 to the nearest ten.
  38. 38.Which is closest to 1792 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600
  39. 39.Which is closest to 698 × 91? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  40. 40.Round 12.46 to one decimal place. =

Answer key

  1. 30
  2. 14.1
  3. 63000
  4. 15000
  5. 30.6
  6. 71.2
  7. 20
  8. 20
  9. 40000
  10. 4000
  11. 1700
  12. 30
  13. 30
  14. 69000
  15. 22.8
  16. 1300
  17. 77000
  18. 1700
  19. 81000
  20. 74000
  21. 80
  22. 18.7
  23. 25.6
  24. 11.3
  25. 22500
  26. 21.4
  27. 3180
  28. 12000
  29. 93.4
  30. 74.7
  31. 35.2
  32. 36000
  33. 20000
  34. 54000
  35. 60
  36. 94.4
  37. 7860
  38. 60
  39. 63000
  40. 12.5

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