Question 13515
When multiplying or dividing integers, is all you need to remember is:

+(+)=+
-(-)=+
+(-)=-
So when both signs are the same, the answer is positive, when signs are different the answer is negative.
ex; 

3(5)=15
-3(-5)=15
-3(5)=-15

I'm not sure what you meant by "and the fraction like ones".

If it is multiplying fractions:
You multiply straight across; the numerator * the numerator, and the denominator * the denominator.
ex;

{{{3/5}}}{{{(2/3)}}}
3(2)=6
5(3)=15
{{{6/15}}}
Hope this help and I got your question right
=)