The plus sign is an operator, not an operand. An operand is something that an operator operates on. For example, A3 and 10 are the operands in the following formula and the operator is the plus sign.
=A3+10
Replicating means copying. So replicating a formula in Excel is copying a formula. This is a very common activity that is done in Excel. You create one formula and then use it in other places on the worksheet.
formula checker
Formula wooksheet
In Excel there can be many hierarchies. Cells are in a worksheet, a worksheet is in a workbook. A grand total formula could be adding up the results formulas giving other totals. There can be hierarchy in graphics.
The formula bar.
Formula bar toward the top left of the screen.
A formula must begin with an equals sign (=).
The Name Box is at the left end of the Formula Bar.
An Excel worksheet or spreadsheet allows data to be easily summed and charted.
color coding
Create a blank worksheet.
Include the external workbook (surrounded by []) and worksheet names (followed by !) in the formula:=SUM([workbook.xls]worsheet!A1:A23)