Bennyboy,
Please provide more information:
--What are the cells?
--What is the data in the cells?
--What is the calculation to be performed?
--What cell do you want this calculation in?
Cell A1: 2
Cell A2: 4
Cell A3: =A2+A1
(Cell A3 will show 6)
Cell A4: =A2-A1
(Cell A4 will show 2)
Cell A5: =A1-A2
(Cell A5 will show -2)
HTH,
Conan