You're welcome, and appreciate the feed-back.
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Regards,

RD

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"pemt" wrote in message
...
thanks a lot!

"Ragdyer" wrote:

Say values in Column B, starting in B1 down:

Enter this formula *anywhere* (except Column B), and copy down as needed:
=SUM(INDEX(B:B,100*ROWS($1:1)-99):INDEX(B:B,ROWS($1:1)*100))

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HTH,

RD

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"pemt" wrote in message
...
hi,

i need to sum data from every 100 rows from top to bottom of total
50,000
rows. how to do it?
my data have two columns:
id score
1 45
2 60
3 85
. .
. .
. .
100 96
. .

so, the sum of 1st 100 rows =45+60+85+...+96
then next 100 rows, ... until to 50,000 rows.

thanks for your help.

pemt