0-6: the percent proportion. 0-6: the percent proportion percent: a ratio that compares numbers to...
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0-6: THE PERCENT PROPORTION
0-6: The Percent Proportion
Percent: A ratio that compares numbers to 100.
To write a percent as a fraction: Write the ratio with a denominator of 100 Simplify the fraction, if possible
Examples 79%
107%
0.5%
79
100
107
100
0.5
100
5
1000
1
200
0-6: The Percent Proportion
Percent proportion: A ratio of part to a whole equal to a percentage. part percentage
whole Is/Of = Percent/100
Example 2 (find the part) 40% of 30 is what number?
Fill in known information
Cross-multiply 100a = 1200 Divide by 100 a = 12
100
a p
b
4
30 00
0
1
a
0-6: The Percent Proportion
Example 3 (find the percentage): Kelsey took a survey of students in her lunch period. 42 out of the 70 students surveyed said their family had a pet. What percent of the students had pets?
Fill in known information Cross-multiply: 4200 = 70p Divide by 70 p = 60
So 60% of the students had pet
0
42
70 10
p
0-6: The Percent Proportion
Example 4 (Find the whole) 67.5 is 75% of what number?
Fill in known information Cross-multiply: 6750 = 75b Divide by
75 90 = b
6
100
7.5 75
b
0-6: The Percent Proportion
What is 35% of 250? 87.5
17 is what percent of 68? 25%
Thirty percent of a number is 39. Find the number. 130
Rudy went to see a baseball game. While keeping stats, he counted 44 at bats for the home team. Of these, 11 batters made a hit. What percent of batters got a hit for the home team? 25%
0-6: The Percent Proportion
Assignment Pages P21-P22 Problems 1 – 31 (odds)
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