1. L.C.M of the denominators is 4.
So, multiply the numerator and the denominator of the first fraction by 2.


Hence,
.
2. L.C.M of the denominators is 24.
So, multiply the numerator and the denominator of the first fraction by 4 and those of the second fraction by 3.


Hence,
.
3. L.C.M of the denominators is 24.
So, multiply the numerator and the denominator of the first fraction by 3 and those of the second fraction by 2.


Hence,
.