Mod

The Mod function calculates the remainder in a division problem.  

When calculating the remainder of a division problem, you should use the following function:

=mod(the cell address of the value you want to divide, the cell address of the  modular value   

For example, if you wanted to divide the value of cell C8 by the value of C9 and find the remainder of this problem, you would use type 
=mod(C8,C9)

When you hit return, the remainder of the division problem will be displayed.