I finally got the Form Fields to Calculate and do a simple
addition.  Now when I am trying to add two different sets  
of numbers and them subtract the second from the first, it
is adding *2

For Example

=Text1+Text2+Text3 (Total Shows in Text4)

Then
=Text5+Text6+Text7 (Total Shows in Text8)

Then I want to subtract Text 8 from Text4 so I typed

=Text4-Text8

What it get is Text 4 + Text 8 * 2

On all fields I have the Calculate On Exit Checked.