1. Do Now 3/29/11 Copy HW in your planner.
Text page 331, #8-56 multiples of 4

2. Objective
SWBAT use a fraction to find the percent of a number

3. Section 7.1, “Percents and Fractions”
means ‘per one hundred’ or divided by 100.
How many cents
are there in a dollar?

4. Percent
100
a ratio whose denominator is 1 15 15 O O O O 15
100
15% =

5. Writing Percents as Fractions29
100
29%
29 out
of 100 4
100 1 25
4 out
of 100 = 4% 90
100 9 10
90%
90 out
of 100 =

6. Writing Fractions as Percents
Write each fraction with
a denominator of 100. 12
100 3 25
x 4
12% 80
100 4 5
x 20
80%

7. Writing Probability as Percent
Suppose you are rolling a two 5-sided pentahedrons. 1 2 3 4 5 6 7 8 9 10
What is the probability as a percent that you will roll a 7?
What is the probability as a percent that you will roll a prime number? a composite number?

8. Finding Percent of a Number
means multiplication
Find 25% of 36. 25
100
25%
Find 70% of 70. 70
100
70%