# Percents%20in%20Everyday%20Life

Views:

Category: Education

## Presentation Description

No description available.

## Presentation Transcript

### Percents in Everyday Life :

Percents in Everyday Life

### What is a percent? :

What is a percent? A percent means “divided by 100” It can be expressed using the symbol: % A percent is equivalent to a fraction with a denominator of 100

### Slide 3:

What are some ways that you use percentages in your life?

### Did you say: :

Did you say: Shopping (discounts, tax) (see video) Eating at a Restaurant (tipping, tax) Calculating your grade in your classes Anything else?

### How will you use percents when you are older? :

How will you use percents when you are older? Paying taxes Interest on a loan Probability of an outcome Calculating your body fat (see video) That is only a few…

### How do percents relate to ratios? :

How do percents relate to ratios? We use a formula to calculate percents by setting two ratios (or proportions) equal to each other:

### Find a percent using a proportion :

Find a percent using a proportion What percent of 25 is 17?

### What percent of 25 is 17? :

What percent of 25 is 17? Substitute the numbers in for the variables: Use cross products to rewrite: 17(100) = 25p 1700= 25p Divide each side by 25: 68 = p

### What percent of 25 is 17? :

What percent of 25 is 17? 17 is 68% of 25

### The Percent Equation :

The Percent Equation You can also use the percent equation to represent a is p percent of b:

### Find a percent using the percent equation: :

Find a percent using the percent equation: What percent of 136 is 51?

### What percent of 136 is 51? :

What percent of 136 is 51? Divide each side by 136: Write decimal as percent: 37.5% = p% Substitute the numbers in for the variables: 0.375 = p%

### Now find other ways to use percentages :

Now find other ways to use percentages Complete other exercises in your textbook using the two formulas just learned