From the Excel help file:
Refer to the same cell or range on multiple sheets
A reference that refers to the same cell or range on multiple sheets is
called a 3-D reference.
Click the cell where you want to enter the function.
Type = (equal sign), enter the name of the function, and then type an
opening parenthesis.
Functions that can be used in a 3-D reference
SUM - adds numbers
AVERAGE - calculates average (arithmetic mean) of numbers
AVERAGEA - calculates average (arithmetic mean) of numbers; includes text
and logicals
COUNT - counts cells that contain numbers
COUNTA - counts cells that are not empty
MAX - finds largest value in a set of values
MAXA - finds largest value in a set of values; includes text and logicals
MIN - finds smallest value in a set of values
MINA - finds smallest value in a set of values; includes text and logicals
PRODUCT - multiplies numbers
STDEV - calculates standard deviation based on a sample
STDEVA - calculates standard deviation based on a sample; includes text and
logicals
STDEVP - calculates standard deviation of an entire population
STDEVPA - calculates standard deviation of an entire population; includes
text and logicals
VAR - estimates variance based on a sample
VARA - estimates variance based on a sample; includes text and logicals
VARP - calculates variance for an entire population
VARPA - calculates variance for an entire population; includes text and
logicals
Click the tab for the first worksheet to be referenced.
Hold down SHIFT and click the tab for the last worksheet to be referenced.
Select the cell or range of cells to be referenced.
Complete the formula, and press ENTER.
