BASIC MICROSOFT EXCEL FUNCTIONS
   
Function: Type this, for example (but first, click once in the cell where you want the result to go):
   
Addition =X1+X2+X3
Subtraction =X1-X2
Multiplication =X1*X2
Division =X1/X2
Sum =SUM(X1:X14)
Sheets =Sheet1!X2     (place this formula in a cell on a different sheet. You can have more than one sheet in an Excel file.)
Sum using Sheets =Sheet1!X1+Sheet2!X1+Sheet3!X1
Sum for many Sheets =Sum('Sheet1:Sheet9'!X1)
   
   
  where X1, X2, and X3  represent, for example, the cells A1, A2, and A3 (or any other cells)