Practicing With Percents By Johnny, Sally, Mary & Joey Period 3

What is a Percent? Percent means “out of 100” 11% means 11 out of 100 Example: If 11% of people liked a movie, that means that 11 people out of every 100 will say they like the movie.

Converting to Percents from… …a decimal -- move the decimal point _____ spaces to the right and add a percent sign (%) 0.83 =83% 1.45 =145% =38.5% …a fraction - divide numerator by denominator (like a test grade) to make a decimal. Then, follow the rule above.

Converting from Percents… …to a decimal - move the decimal point ____ places to the ____ and drop the percent sign 14% = % =0.025 …to a fraction - drop the percent sign and put the number over 100. Then, simplify the fraction 14% =2.5% =

Solving Percent Problems We need to use a _________ to solve percent problems or

Example 1 What is 12% of 45? Set up the proportion Cross multiply Solve the one step equation by dividing

Example is 35.5% of what number? Set up the proportion Cross multiply Solve the one step equation by dividing

Example 3 What percent of 36 is 1.8? Set up the proportion Cross multiply Solve the one step equation by dividing 5%

Real World Example

Quick Quiz 1.Find 11% of 68 2.What percent of 475 is 285? 3.98% of what number is 24.99? 4.Convert 84.5% to a fraction and a decimal 5.You want to buy a shirt that is $25.99 and is on sale for 25% off. How much will you pay? Answers: % $19.49