# Percent of a Number

In this video, we will be learning how to find a percent of a number using proportions.

In math, “of” means multiply

Percent Formula: $\frac{Percent}{100}=\frac{Part (is)}{Whole(of)}$

For Example:

What is 8% of 40?

$\frac{8}{100}=\frac{x}{40}\leftarrow$ First we cross-multiply

$\frac{320}{100}=\frac{100x}{100}\leftarrow$ Then we divide by 100 on both sides to isolate x

$3.2=x$

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Used by students across the country. Pre-Algebra, Algebra I, Geometry, & Algebra II