Normally you wouldn't use SUM(C11+C21), either

=SUM(C11,C21)

or just

C11+C21

but that doesn't explain your problem.....what happens if you press F9, how
is the result cell formatted?

"loveforlife" wrote:

I enter =SUM(C11+C21) C11 is 10000 and C21 is (9000)
My formula result is 0. What gives?
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loveforlife