Exploring Percent Error in Math 7

Mrs. Abia presents a lesson on percent error, explaining how to compute it using the formula: (approximate value - exact value) / exact value * 100. The lesson includes examples of measuring a TV and calculating absolute and percent errors. The importance of percent error is highlighted, showing its relevance in different contexts.

What is the formula for percent error?

• Approximate amount minus exact amount, divided by exact amount, multiplied by 100

• Exact amount minus approximate amount, divided by approximate amount, multiplied by 100

• Approximate amount plus exact amount, divided by exact amount, multiplied by 100

• Exact amount plus approximate amount, divided by approximate amount, multiplied by 100

How is a TV measured?

• On the diagonal

• Around the perimeter

• Vertically

• Horizontally

What is the absolute error if the exact value is 15 inches and the measured value is 15 and 2/8 inches?

• 3/8 inch

• 4/8 inch

• 2/8 inch

• 1/8 inch

If Taylor's measurement is 15 and 2/8 inches and the exact value is 15 inches, what is the absolute error?

• 3/8 inch

• 2/8 inch

• 1/8 inch

• 4/8 inch

What does it mean if the absolute error is positive?

• The exact value is incorrect

• The approximation was too small

• The measurement is invalid

• The approximation was too big

What is the percent error if the approximate value is 15 and 2/8 inches and the exact value is 15 inches?

• 4.6%

• 3.6%

• 2.6%

• 1.6%

What is the percent error for Connor's measurement if his measured value is 15 and 4/8 inches and the exact value is 15 inches?

• 1.6%

• 2.6%

• 3.3%

• 4.3%

If Jordan's measurement is 14 and 6/8 inches and the exact value is 15 inches, what is the percent error?

• 4.6%

• 3.6%

• 2.6%

• 1.6%

Why is percent error more useful than absolute error?

• It provides a relative measure of error

• It does not require exact values

• It is easier to calculate

• It is always a smaller value

What is the significance of a smaller percent error?

• It suggests the exact value is incorrect

• It indicates a larger absolute error

• It means the measurement is less accurate

• It shows the approximation is closer to the exact value