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Finding Percent Error

Finding Percent Error. Units to compare: English Unit Metric Unit yards to meters feet to decimeters inches to centimeters In a perfect world, there are actually: 0.91 meters in one yard 3.048 decimeters in one foot 2.54 centimeters in one inch. To find percent error: Step 1:

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Finding Percent Error

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  1. Finding Percent Error

  2. Units to compare: • English UnitMetric Unit yards to meters feet to decimeters inches to centimeters • In a perfect world, there are actually: • 0.91 meters in one yard • 3.048 decimeters in one foot • 2.54 centimeters in one inch

  3. To find percent error: • Step 1: • Take your metric measurement divided by your English measurement. • Height of book: • 11.2 inches • 28.3 centimeters • 28.3 ÷ 11.2 = 2.53

  4. Step 2: • Take your result minus the actual number for the units you are using. • Actual for inches and centimeters is 2.54. • 2.53 – 2.54 = -0.01

  5. Step 3: • You might end up with a negative number, so take the negative sign off. • -0.01 = 0.01

  6. Step 4: • Take your result divided by the actual number for the units you are using. • 0.01 ÷ 2.54 = 0.0039

  7. Step 5: • Change this number into a percent by multiplying it by 100 (or by moving the decimal point two places to the right – same answer) • 0.0039 x 100 = 0.39%

  8. Step 6: • Check. Is your answer less than 10%? • For this lab, having less than 10% error is okay.

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