Excel help please
posted by Kimberly .
How would I write a formula to multiply the number in cell z675 times the number in cell a1

These are very simple formulas to write. I did two for you the other day, plus I included a link to help you learn.
What do you not understand about these?
http://www.jiskha.com/display.cgi?id=1359154132
http://www.jiskha.com/display.cgi?id=1359154331 
I don't know how to do any excel

Did you read any of those howto links I sent?
If you don't know how and you don't have a teacher who will explain, then you should think about dropping the class. 
=(Z675*A1)
=  shows that it is an equation
()  are used for grouping
Z675  is that cell
*  multiplication
A1  the other cell