Do Now 3/29/11 Copy HW in your planner.

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Presentation transcript:

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

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

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

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

Writing Percents as Fractions 29 100 29% 29 out of 100 4 100 1 25 4 out of 100 = 4% 90 100 9 10 90% 90 out of 100 =

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%

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?

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