Here's how to subtract 1/3 from 4/12:
We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.
So we multiply 4 by 3, and get 12.
Then we multiply 1 by 12, and get 12.
Next we give both terms new denominators -- 12 × 3 = 36.
So now our fractions look like this:
Since our denominators match, we can subtract the numerators.
12 − 12 = 0
So the answer is:
|Zero divided by anything is just zero. So that's the final answer:|