Bring up the Report Properties (by right clicking outside the report in Layout view)

Now go to the Code tab and write (or copy and paste) in this code:

Function CalculateFraction(ByVal Numerator As Double, ByVal Denominator As Double) As Double

 

If Denominator = 0 Then

          CalculateFraction = 0

Else

          CalculateFraction = Numerator / Denominator

End If

Return CalculateFraction

End Function

 

 

Now insert the following expression into the desired textbox and format according:

 

=Code.CalculateFraction(Fields!Numerator.Value, Fields!Denominator.Value)

 

You could also use the following IIF expression:

 

=IIF(Fields!Denominator.Value = 0, 0, Fields!Numerator.Value / IIF(Fields!Denominator.value = 0, 1, Fields!Denominator.Value))

 

But the best thing about using the Embedded Code it's easier to use and reusable.