The SUM is superfluous, + makes it add

=IF(AND(K18<K87+110,K18K87+90),K18+800,"")

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HTH

Bob Phillips

"Gary Brown" wrote in message
...
=IF(AND(K18<SUM(k87+110),K18SUM(K87+90)),SUM(K18+ 800),"")
hth,
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Gary Brown



"Sheryl" wrote:

This is what I think the formula should read:
=IF(K18<SUM(k87+110)SUM(K87+90),SUM(K18+800),"")
Excel doesn't agree. I'm trying to say that K18 is an entry cell and if
that value falls between K98+100 (+/-10) that the result will add 800 to
K18.
If it falls outside of the +/- range, then the value will return blank.
Help please!