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# Percents by Proportions

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Students learn how to solve percents by using proportions.

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### Percents by Proportions

1. 1. Finding Percents<br />EdTech 521<br />Asynchronous Lesson<br />By Cassie Koch<br />8th Grade Math<br />
2. 2. Lesson<br />View presentation<br />Quiz Star:<br />http://quizstar.4teachers.org/indexs.jsp<br />Virtual Field Trip:<br />http://edtech2.boisestate.edu/kochc/521/indian_education/home.html<br />
3. 3. Percents in the Real World<br />Grades<br />Shopping<br />Travel<br />Chemistry<br />Weather<br />Interest<br />Sales Tax<br />Tips<br />
4. 4. What are Percents?<br />A part of the whole<br />Example: What percent of Pizza is left?<br />Whole = 8 slices<br />Part left = 4<br />Ratio: Part = 4 = 1= 0.5 = 50%<br /> Whole 8 2<br />
5. 5. Use Proportions<br />Set your part over whole ratio equal to “p” over 100.<br /> Part = p<br /> Whole 100<br />Pizza Example:<br /> 4 = p<br /> 8 100<br />
6. 6. Solving Proportions<br /> 4 = p<br /> 8 100<br />Cross multiply:<br />4x 100 = 8 xp<br /> 400 = 8p<br />Solve for p<br />400 = p<br /> 8<br />P = 50% <br />
7. 7. Example:<br />What percent of 162 is 90?<br />Part = 90<br />Whole = 162<br /> 90 = p<br /> 162 100<br />Cross Multiply<br />90 x 100 = 162 xp<br />900 = 162p<br />Solve for p<br /> 900 = p<br /> 162 <br />P= 56%<br />
8. 8. Your Turn<br />24 is what percent of 60?<br />
9. 9. Your Turn Cont.<br />Part=<br />24<br />Whole =<br />60<br />24 = p<br /> 60 100<br />2400 = 60p<br />p = 40%<br />
10. 10. Take the Quiz<br />Go to Quiz Star:<br />http://quizstar.4teachers.org/indexs.jsp<br />Login: edtech521<br />Password: edtech521<br />
11. 11. Virtual Field Trip<br />Go to:<br />http://edtech2.boisestate.edu/kochc/521/indian_education/home.html<br />Study about the tribes in Montana.<br />Answer the three questions on each tribe in a Google doc<br />Draw the tribe’s reservations in the map.<br />
12. 12. Resources<br />Pizza Image: <br />http://ocmboces.org/clt/larmstrong/K2sites/Armstrong/Math/numsense/numsense.htm<br />