The cross product property, also known as cross-multiplication, is a faster method to simplify an equation which has fractions on both sides of the equal sign. An example is $\frac{x}{5}=\frac{2}{7}.$

The procedure is that both sides are multiplied by $5$ and $7,$ the denominators of both sides. The result is that the denominators and multiplier undo each other. With cross multiplication, these steps are done at the same time.