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|Arithmetic: Percent Problems
|While most people think the SAT is a test of advanced math, about one-fourth
of the questions are arithmetic. Most students need to review this arithmetic.
|SAT TIP: Review three types
of percent problems.
|Questions? Write the SATtutor@SATpreparation.net|
|If you know the whole and you want to find a percent of it,
multiply the whole by the decimal equivalent of the percent.
For example: What is 40% of $300? ($300 is the whole amount.)
X = .40 x $300 or X = $120
If you know a part of a whole and you want to find the whole,
divide the part by the decimal equivalent of the percent.
For example: $120 is 40% of what amount? ($120 is a part of the whole.)
$120 = .40 x X (Now, divide both sides by .40)
$300 = X
If you want to find what percent a part is of a whole,
divide the part by the whole.
For example: $120 is what percent of $300?
$120 = X x .01 x $300 or
$120 = X x $3 (Now, divide both sides by 3.)
.40 = X or X = 40%
Practice with these examples:
An easy problem for scores from 200 to 400
A moderate problem for scores from 400 to 600
A difficult problem for scores from 600 to 800
For more practice:
Click here for problems in The Official SAT Study Guide.
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