4.4 Solve Percent Change and Percent Error Problems

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To Section 4.5

MATHEMATICS OBJECTIVE

Students will be able to:

calculate percent change and percent error.
understand the percent equation and how it leads to the percent change formula.

ESSENTIAL UNDERSTANDING

The percent equation can be manipulated to find the percent change ratio and percent error.

4.4 Blank Notes

4.4 Filled Notes

4.4 Notes Video

I can solve authentic problems involving percent change and percent error.

I can understand the percent equation and the different ways it can be used.

Accessible text

Percent change and percent error problems are kinds of percent problems. You can use the percent equation to solve them.

amount of change = percent change × original amount

[Inferred by rearranging: percent change = amount of change / original amount.]

The amount of change is the difference between original and new values.

[Two bar models: percent increase, with new value longer than original; percent decrease, with new value shorter than original. Original value labeled 100%.]

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