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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

Maintaining Mathematical Proficiency

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Exercise 2 Page 665

The percent proportion is a proportion that equates a part of a whole to a percent out of 100.

17

Practice makes perfect

The percent proportion is a proportion that equates a part of a whole to a percent out of 100. part/whole=percent/100 ⇔ a/w=p/100 We can find what number is 68 % of 25 is by thinking about 25 as the whole. Let's substitute p= 68 and w= 25 into the formula and solve for a.

a/w=p/100

w= 25, p= 68

a/25=68/100

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Solve for a

a/b=.a /4./.b /4.

a/25=17/25

LHS * 25=RHS* 25

a/25* 25=17/25 * 25

FracMultDenomToNumber

a/25* 25 = a

a=17

Therefore, 17 is 68 % of 25.

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Exercises p.665