Percents with Proportions Math 7 Unit 6 Adapted from Prentice Hall Lesson 6-6.

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Presentation transcript:

Percents with Proportions Math 7 Unit 6 Adapted from Prentice Hall Lesson 6-6

Solving Percents Using Proportions Finding Part of a Whole To find part of a whole number, follow the steps below: Write a __________. Write the _____ ________. Solve for the ________. Simplify proportion cross products variable

Solving Percents Using Proportions Find 65% of 245. Write the proportion Write the cross products Simplify Divide both sides by 100 Part of the whole

Solving Percents Using Proportions 25% of 124 is what? Write the proportion Write the cross products Simplify Divide both sides by 100 Part of the whole

Solving Percents Using Proportions 43% of 230 is what? Write the proportion Write the cross products Simplify Divide both sides by 100 Part of the whole

Solving Percents Using Proportions 12.5% of 80 is what? Write the proportion Write the cross products Simplify Divide both sides by 100 Part of the whole

Solving Percents Using Proportions Finding a Percent Set up proportions to help you solve for percents. What percent of 250 is 138? Write the proportion Simplify Divide both sides by 250 Percent Write the cross products

Solving Percents Using Proportions What percent of 60 is 52? Write the proportion Write the cross products Simplify Divide both sides by 60 Percent

Solving Percents Using Proportions 14 is what percent of 15? Write the proportion Write the cross products Simplify Divide both sides by 15 Percent

Solving Percents Using Proportions Finding a Whole Amount To solve for a whole amount, set up the same thing as above -- __________. Then solve for the missing value. proportion

Solving Percents Using Proportions 19 is 75% of what number? Write the proportion Write the cross products Simplify Divide both sides by 75 Whole Amount

Solving Percents Using Proportions 310 is 99% of what number? Write the proportion Write the cross products Simplify Divide both sides by 99 Whole Amount

Solving Percents Using Proportions 207 is 46% of what number? Write the proportion Write the cross products Simplify Divide both sides by 46 Whole Amount

Solving Percents Using Proportions A tile floor has 90 blue tiles, which is 15% of all the tiles on the floor. How many tiles are there on the floor in total? Write the proportion Cross products Divide both sides by 15 Whole Amount

Solving Percents Using Proportions In 2001, there were a total of 6,157 million people on Earth. 40% of the people were 19 or younger. How many people fall into that age bracket? Write the proportion Cross products Divide both sides by 15 Whole Amount 2,462.8 million people