You have nearly answered your own question:
=DEC2HEX(HEX2DEC(A1)+HEX2DEC(A2))

--
Bernard V Liengme
www.stfx.ca/people/bliengme
remove caps from email

"Dave" wrote in message
...
Hi,
As the subject states, how do I add together cells containing hex numbers.
I
tried
the following...

A1 contains 0f
a2 contains 0f
a3 contains = a1 + a2
result #VALUE!

I know that it knows the cells could be hex because if I do =hex2dec(a1)
in
another cell it converts it. Is there anyway in Excel to explicitly set
the
number type of a cell?

Regards,
Dave.