Sandy wants to split one-half of a pan i have brownies between herself and three friends. how much of the pan of brownies will each person get?

So really the question is asking what is  divided by 4. When you divide fractions you flip it and multiply. So 4 as a fraction is . When you flip it you get . So now we multiply:

 
When you multiply fractions, you multiply across the top and across the bottom. So 1 times 1 is 1, and 2 times 4 is 8 so your answer is each person gets th of the pan.

Hope that helps.