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# Percent Equations

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### Percent Equations

1. 1. Percent Equations
2. 2. Solving Percent Equations <ul><li>Three types of problems </li></ul><ul><ul><li>What is 50% of 20? </li></ul></ul><ul><ul><li>10 is 50% of what? </li></ul></ul><ul><ul><li>What percent of 20 is 10? </li></ul></ul>
3. 3. Solving Percent Equations <ul><li>In an equation: </li></ul><ul><li>What do we represent the is with? </li></ul><ul><li>= </li></ul><ul><li>What do we represent the of with? </li></ul><ul><li>x </li></ul><ul><li>What do we represent the what with? </li></ul><ul><li>a variable </li></ul>
4. 4. Solving Percent Equations <ul><li>Simple equation that always works: </li></ul>
5. 5. Solving Percent Equations <ul><li>15 is what percent of 12? </li></ul><ul><li>Cross multiply and divide to find the answer. </li></ul>
6. 6. Solving Percent Equations <ul><li>(15 x 100)/12 = </li></ul><ul><li>125 </li></ul>
7. 7. Solving Percent Equations <ul><li>What is 15% of 12? </li></ul><ul><li>Cross multiply and divide </li></ul>
8. 8. Solving Percent Equations <ul><li>(15 x 12)/100 </li></ul><ul><li>1.8 </li></ul>
9. 9. Solving Percent Equations <ul><li>12 is 15% of what? </li></ul><ul><li>Cross multiply and divide </li></ul>
10. 10. Solving Percent Equations <ul><li>(12x100)/15 </li></ul><ul><li>80 </li></ul>
11. 11. Solving Percent Equations <ul><li>Practice: </li></ul><ul><li>What is 4% of 150? </li></ul><ul><li>What % of 51 is 17? </li></ul><ul><li>6% of what is 36? </li></ul><ul><li>Answers: </li></ul><ul><li>6 </li></ul><ul><li>33 1/3 % </li></ul><ul><li>600 </li></ul>