1. Finding the Percent of a Number
LESSON 7-7
Additional Examples
Use a proportion to find 60% of 45.
Let n represent the number you want to find.
part
whole n 45 60
100 =
100  n = 60  45 Write the cross products.
100n = 2,700 Multiply.
n = 27 Divide each side by 100.
60% of 45 is 27.

2. Finding the Percent of a Number
LESSON 7-7
Additional Examples
Find 88% of 250.
88% = Write 88% as a decimal.
0.88  250 = Multiply.
So, 88% of 250 is 220.

3. Finding the Percent of a Number
LESSON 7-7
Additional Examples
Use mental math to find 75% of 84.
What you think
75% is equivalent to ;  84 = % of 84 is 63. 3 4
Why it works
75% = 75
100
= Write 75% as a fraction in simplest form. 3 4
 84 =  Multiply 84 by . Rewrite 84 as . 3 4 84 1
= Simplify.
= 63 Divide.
252 4