Algebrarules.com

The most useful rules of basic algebra,
free, simple, & intuitively organized
X

Howdy! Here are a few very handy rules of algebra. These basic rules are useful for everything from figuring out your gas mileage to acing your next math test — or even solving equations from the far reaches of theoretical physics. Happy calculating!

Algebra Rule 3

Dividing the numerator equals multiplying the denominator

$${({a \over c}) \over b} = {a \over bc}$$
Description:

Because of the reciprocal relationship of a fraction's numerator and denominator, if you divide the numerator by a particular number, it has the same effect on the fraction's overall value as if you multiply the denominator by that same number

$${ \left({1 \over 5}\right) \over 2} = {1 \over 10} = {1 \over (2*5)}$$
« Previous Rule Next Rule »