1. do warmups 2. check hw 1.how do you find a percent, based on part of a whole? 2.what percent of...
TRANSCRIPT
1. Do Warmups 2. Check HW
1. How do you find a percent, based on part of a whole?
2. What percent of 52 is 39?
3. What percent of 78 is 48.75?
4. What percent of 90 is 110? Round to the nearest hundredth of a percent.
4.2: Percent of Change
Percents of Increase/Decrease
• A very common way of using percents is to talk about the percent by which an amount changes.
• For example:At the beginning of the year, I had 20 students in time block 1. Now, I have 18. The number of students decreased by 2.2 is 10% of 20 (you can use percent equation to check), so there was a 10% decrease in the number of students.
Finding the percent of change
• Problem: Yesterday, I had $30 in my savings account. Today, I have $45.
A. Was this an increase or a decrease?
B. What was the percent of change?How to:1. Find the amount of change.2. Find what percent the amount of change is compared to the original amount.