New to LiveCycle and was dumped a project to complete.

I'm trying to creating a form where there will be 3 fields.  two numeric fields and a third numeric field where I'd like to show the total percentage ex: field A 70 / field B 100 *100 = Field C (Total Percentage) but I keep getting a arithmetic underflow error.  Need some help

I thought it would be something like:

Field C=FieldA/FieldB*100

but I keep getting the arithmetic underflow error.  The formula actually works but I'm trying to get rid of that error.

Please help if possible.  Thanks.