Need help with Hiding Fields with Calculations

I have a form with hidden fields and visible fields, I aslo have a checkbox to hide and unhide the fields. I have 3 fields that are hidden until the checkbox is unchecked, once the user unchecks it he adds the data to 2 of the fields and the 3rd calculates the total of the 2 hidden. I then use that total of the 2 and divide it by a visible field and that totals into another visible field. The problem i'm having is I can't get the hidden_total field to calculate unless its presence is visible, so when I unhide and add everything up there is a field showing that i want to go back to being hidden. Here is how I have it.

Hidden fields "abonding"+"abonding2" = hidden field "total_abond"

I then I have 2 visible fields where "abond_forfeit1" the user adds the amount and then I have another visible field, "abond_forfeit", that takes "abond_forfeit1"/ hidden field "total_abond".

I have everything working but when I get all the totals and want to hide the hidden fields again the data in the hidden field "total_abond" is still showing because I can't get it to calculate the visible fields if I have the Presence of this field set to Hidden from Layout or Invisible.

Any help on how to get that total to work and hide once I have the calculations in would be appreciated.