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4 1 Proportions

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Transcript of "4 1 Proportions"

1. 1. Warm Up <ul><li>Write in simplest form </li></ul><ul><li>Solve. </li></ul>
2. 2. Warm Up <ul><li>Write in simplest form </li></ul><ul><li>Solve. </li></ul>1
3. 3. Proportions Some of the most useful items on the math menu Chapter 4.1
4. 4. Write 5 to 9 <ul><li>as a fraction </li></ul><ul><li>as a ratio </li></ul><ul><li>What’s the difference? </li></ul>
5. 5. Are They Equal? <ul><li>Cross Multiplication </li></ul><ul><li>What is 10 x 5? </li></ul><ul><li>What is 2 x 25? </li></ul><ul><li>If both cross multiplications statements are equal, the fractions are equal. </li></ul>
6. 6. Are They Equal? <ul><li>Cross Multiplication </li></ul><ul><li>What is 16 x 3? </li></ul><ul><li>What is 4 x 12? </li></ul><ul><li>If both cross multiplications statements are equal, the fractions are equal. </li></ul>48 48
7. 7. Are They Equal? <ul><li>Cross Multiplication </li></ul><ul><li>What is 3 x 60? </li></ul><ul><li>What is 4 x 48? </li></ul>
8. 8. Find the missing number. <ul><li>Using Algebra </li></ul><ul><li>14 x 35 = 10x </li></ul>
9. 9. Rectangle ABCD ~ WXYZ <ul><li>Solve for s. </li></ul>B W D C A X Y Z 9 27 s 25 25 s
10. 10. Book Sale <ul><li>4 for \$1.25 </li></ul><ul><li>How much is one? </li></ul><ul><li>Label books </li></ul><ul><ul><li>and price </li></ul></ul><ul><li>Set up a proportion. </li></ul><ul><li>Write down labels to help. </li></ul>
11. 11. Cross Multiply and divide <ul><li>4 for \$1.25 </li></ul><ul><li>How much for one? </li></ul>
12. 12. How Tall? <ul><li>Man – 6 ft </li></ul><ul><li>Man’s shadow – 9 ft </li></ul><ul><li>Tree’s shadow – 45 ft </li></ul><ul><li>Set up a proportion. </li></ul>
13. 13. Proportion <ul><li>Man – 6 ft </li></ul><ul><li>Man’s shadow – 9 ft </li></ul><ul><li>Tree’s shadow – 45 ft </li></ul><ul><li>Labels </li></ul><ul><li>Actual Height </li></ul><ul><li>shadow length </li></ul>
14. 14. “Lush-Lawn Fertilizer” <ul><li>Use 4 lb. for 1500 sq. ft. </li></ul><ul><li>How much to cover 2400 ft 2 ? </li></ul><ul><li>Labels: </li></ul>
15. 15. “Lush-Lawn Fertilizer”
16. 16. Assignment <ul><li>Page 168 : 13-45 odds </li></ul>
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