example: 3/4 + 2/3 you half to change it into a similar fraction because the dinaminator is not the same so the new denaminator is 12 and then add the numirator and the answer is 5/12 if you can simplify then simplify it
subtracting
3/4 - 2/3 just do the same thing but subtrac it in the lass part so the answer is 1/12