Question

3/5-3/12=?

Answer 1

21/60

Answer 2

3/5 - 3/12 = ?

You always have to find a common denominator.
Easiest way to do that is to multiply the denominators.

5 x 12 = 60

Remember, what ever you do to the bottom, you have to do to the top.
Now, you change youre fractions.

3/5 becomes 36/60
(you multiplied 5 by 12 to get 60, so you have to multiply 3 by 12 too)
Same with 3/12

3/12 becomes 15/60 (12 was multiplied by 5, so three is multiplied by 5).

Now, SUBTRACT the numerators! YAY

36/60 - 15/60 = 21/60