Hi Eileen
if you use the SHIFT key then they're counted as one parameter ... what the
issue is here is that the syntax of the SUM function is
SUM(number1,number2, ...)
where Number1, number2, ... are 1 to 30 arguments for which you want the
total value or sum.
so,
=SUM(A222:A230)
is only couned as one arguement, whereas
=SUM(A222,A223,A224,A226,A229,A230)
is counted as 6
so coming back to your original problem, you should be able to select up to
30 arguments when using the SUM function without problems, unless you're
exceeding the maximum number of characters allowed in a function (which is
1024 characters)
so let's try something else ... select the 29 cells you want to add using
the control key and click in the name box (little box to left of formula
bar), type a name (e.g. CCells) and press Enter
now in a cell type
=SUM(CCells)
and see if that works.