Getting made redundant soon. My weekly gross pay is being calculated as 769.23 - 40000/52. In my payslip every month and on the calculation I received from HR my monthly gross pay is 3333.33. 3333.33/4 = 833.33
Note that a calendar month is not exactly four weeks - except February in a non leap year! Dividing annual gross by 52 would seem to be the more accurate way to determine weekly gross.
I would assume so. After all, in general, annual gross divided by 52 is your weekly wage. For what it's worth the DETE have a redundancy calculator here which might help you double check your figures. There are also some useful links in the Careers and Employment Issues key topics list thay might be of assistance to you.