Go to cell C3 and type the = (equal sign) followed by the constants and operators that you want to use in the calculation. e.g. type in cell C3 the formula =B1-A1
Press Enter. Note: Data: 1 and 5 Formula: =B1-A1 Description: the formula subtracts the value in cell B1 from the value in A1. Result: =B1-A1