Advertisement

Here's another one:
 

Solve       (1/4)x = 9

There are a couple different ways to deal with this one:

WAY 1:

Rewrite it like this:

(1/4)x = 9
Since the 4 is dividing into the x,
we'll multiply both sides by
4 to undo him:

4 * (1/4)x = 9 * 4   which gives   (4/4)x = 9*4   which gives   x = 36

WAY 2:

Use the fraction fact that 4 is the multiplicative inverse (big word time!) of 1/4:

4 * (1/4)x = 9 * 4  which gives   x = 36

Remember:

4 * (1/4) = (4/1) * (1/4) = 4/4