1. Splash Screen

2. Then/Now Find percent of error. Find percent of increase and decrease.

3. Concept Percent of Error

4. Example 1 Find the Percent Error In science class, Mrs. Moore’s students were directed to weigh a 300 gram mass on the balance scale. Tina weighed the object and recorded it as 324 grams. Find the percent error. Step 1Subtract to find the error guess – actual = error 324 – 300 = 24

5. Example 1 Find the Percent of Change Cross multiply. Answer: 8% 24 100 = 300 p 8% = p Divide. Step 2Write a ratio that compares the error to the actual. Express the ratio as a percent.

6. Example 1 Find the Percent Error The veterinarian weighed Oliver’s new puppy on a defective scale. On the scale, his puppy weighed 40 pounds, but his actual weight is 36 pounds. What is the percent of error in measurement of the defective scale to the nearest tenth?

7. Example 1 Find the Percent Error