Not entirley sure if I have understood you - but the Conditional Formatting
is done through the Format option on the Toolbar and is:
Condition 1
Cell value is less than -4 then I have pattern as blue and font
white

Condition 2
Cell value is greater than 4 then I have pattern as green and font
automatic(black)

Can't see any gaps with the 4 -4.


"Ragdyer" wrote:

What's your actual CF formula?

Do you have an un-addressed gap between 4 and -4?
--
Regards,

RD

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"Nick Horn" wrote in message
...
Hi many thanks for your help on both my queries.

The cells that you gave me the formula for (below) uses conditional
formatting, highliting the cell green if greater than 4 and blue if less
than
-4.

Using your formula results in the cell highlighting Green - any ideas as
to
why? I can live with the problem so if it takes up too much of your time
please don't wory about it.

Best wishes

Nick

"Teethless mama" wrote:

=IF(OR(A1="",B1=""),"",A1-B1)

"Nick Horn" wrote:

I need to to subtract two cells. If the cell is empty I need a null
return.
e.g.
A1 B1 C1
22 20 2
10 8 -2
10 The value in C1 needs to be blank, so that when the value
in A1
is added later then C1 will recalculate.

The resultant calculated values will be used in mean, standard
deviation and
COUNTIF calculations.
As always many thanks to all of you out there - you are doing a
brilliant
job for duffers like me.