Question

Subtract mixed numbers with unlike denominators. 5 1/7 - 1 1/3 =

Answer 1

`-5(74)/(21)`

Explanation:

First find a common denominator. To do that think of a number that both 7 and 3 can go into. I usually just multiply the two numbers together. So lets use 21.

Take 5
`(1)/(7) * (3)/(3)` and
`(11)/(3) * (7)/(7)`

This gives you
`5 (3)/(21)-(77)/(21)`

Now you should have
`5(-74)/(21)`

Since we can't Simplify -74/21 we can just leave it

So your final answer would be
`-5(74)/(21)`