simple formula with blank cells

[Brian]

I have values in cells a1 and b1 however a1 or b1 can be blank. The formula
in c1 should add the values of a1 and b1 only if there is a value in a1 and
b1 otherwise if a1 or b1 are blank the value of c1 should remain blank. I
appreciate help with a formula in c1.

[Reid McTaggart]

=IF(OR(ISBLANK(A1),ISBLANK(B1)),"",A1+B1)

-Reid

"Brian" wrote:

> I have values in cells a1 and b1 however a1 or b1 can be blank. The formula
> in c1 should add the values of a1 and b1 only if there is a value in a1 and
> b1 otherwise if a1 or b1 are blank the value of c1 should remain blank. I
> appreciate help with a formula in c1.