I'm using microsoft office 2007 and I am making a spreadsheet to show earthwork calculations. I need to show the formula steps as well as the results

example:
A1=10 B1= 5 x 10 C1= results A1*A2
A2=5

is this possible for excel to actually show the math steps involved? not just A1*A2 or =SUM(A1*A2)

Thanks for Any help