Percents%20in%20Everyday%20Life

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

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