Macro to transform formulas into values across multiple tabs

Hi everybody,

I have never written a macro and when I record one I usually have trouble with the relative references.
I am trying to write a macro to transform formulas into values every month.
I want to transform formulas:
- across a range of tabs: each tab is exactly alike and is named page-1 to page 25
- on a different column every month (same column across all tabs)
- on the same rows: L168 to L227 and L266 to L277 (same rows across all tabs)

Can anyone help?
Thanks!!