Percent Change

1.  DIFFERENCE  $\div$  ORIGINAL

2. THINK about the question... are the numbers in the problem increasing or decreasing?

3. Change the decimal to a PERCENT by moving two decimal spots to the right.

At noon, a tank contained 10 cm of water. After several hours, it contained 7 cm of water. What is the percent change? Was it increase or decrease?

Craig likes to collect vinyl records. Last year he had 10 records. Now he has 12 records. What is the percent change? Was it increase or decrease?

Shaun estimated that the attendance at a college lacrosse game was 3,000. The actual attendance was 3,296. What is the percent error of Shaun's estimate? Round to the nearest whole percent.

Note:
Always divide: DIFFERENCE  $\div$   ACTUAL

Rihanna has a container with volume of 1.5 liters. She estimates the volume to be 2.1 liters. What is the percent error?

Note:

Always divide: DIFFERENCE  ÷ ACTUAL