Pre Algebra Periods 1, 2, & 4

Percent Problems 6-6 and 6-7:

2 METHODS: EQUATION AND PROPORTION

EQUATION METHOD:
Just TRANSLATE and SOLVE for the missing number
Remember: OF = MULTIPLY!

EXAMPLE:
What percent of 25 is 13?

first put the = sign under the word is

What represents the variable-- the unknown

where you see of use ( )

p 25 = 13 but rewrite as

25p = 13, so p = .52 or 52%

EXAMPLE:
Find 60% of 15
.6(15) = 9

EXAMPLE:
35% of what number is 52.5
.35n = 52.5 so n = 150

PROPORTION METHOD

% thth the"is"
-------- = ---------
100 theh "of"

Substitute what you know, solve for what you don't know.
ALWAYS LOOK TO SEE IF YOU HAVE THE % FIRST BECAUSE IT'S THE EASIEST!
Next, see if you have "of"