6. The Percent Proportion - 0. Preparing for Algebra - McGraw Hill Glencoe Algebra 1 Texas, 2016

We can use the percent proportion to rewrite the given percent as a fraction in simplest form. The percent proportion is a proportion that equates a part of a whole to a percent out of 100. part/whole=percent/100 ⇔ a/b=p/100 By substituting p= 5 into the formula, we can determine the fraction that is equivalent to 5 %.

a/b=p/100

Substitute

p= 5

a/b=5/100

ReduceFrac

a/b=.a /5./.b /5.

a/b=1/20

Therefore, 5 % is the same as 120.

Extra

Percent

A percent is a ratio that compares a number to 100. Usually, we represent percent with the symbol %. To write a percent as a fraction, we need to express the ratio as a fraction with a denominator of 100. Let's see one example! 50 % = 50100 We can also convert percents into decimal by moving the decimal point 2 places to the left. Imagine that we want to convert 75 percent into decimal.

Therefore, 75 percent is equal to 0.75. There are many possibles situations in life where we use a percent. Let's see some examples!

Sales tax
Discounts, markdowns, and sales.
Calculate tips at a restaurant.

Exercise 1 Page p21

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