Proportions And Percents

Chapter 6, Section 4: Proportions and Percents Warm Up: Solve each proportion = 98.9 d 43 100 X = 7 D = 230 K = 25 M = 18 = 25 100 x 28 = 52 100 13 k = m 100 27 150

Percent  Proportion ,[object Object],0% 0 75% 30 40 100% Part Whole Draw a model of 0 to 40. Then divide the model into 4 sections and color in 3 of the 4 sections. You can also make a proportion. 75/100 = 30/40

Example 1 ,[object Object],0% 0 100% 65% 245: Whole n  part 65/100 = n/245 (Write a proportion) 65(245) = 100n (Cross Product) 65(245)/100 = n (Division Prop. Eq.) n = 159.25 159.25 is 65% of 245.

Now, Do It Without Drawing ,[object Object],[object Object],[object Object],31 98.9 10 IS OVER OF Turn the % into a fraction equal to IS over Of.

What Percent of a # is #? ,[object Object],[object Object],[object Object],52/60 = x/100 (remember that percent is fraction with a denominator of 100). (cross product) (simplify) (solve)

Determine Percentage, to 10 th of a Percent ,[object Object],[object Object]

Finding Whole Amounts. ,[object Object],[object Object],[object Object]

Figure This One Out. ,[object Object]

Try These Too ,[object Object],[object Object],25.3 313.1

Word Problem ,[object Object],3,560 Estimated 748 1998 915 1990 ? 1980 Number of Screens Year

One More Drive In Question ,[object Object],2,824 Screens 748 1998 915 1990 ? 1980 Number of Screens Year

Assignment #22 ,[object Object],[object Object]

Proportions And Percents

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