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Just think of addition and subtraction as directions on the number line. There are also several rules and properties that define how to perform these basic operations. To add integers having the same sign, keep the same sign and add the absolute value of each number. To add integers with different signs, keep the sign of the number with the largest absolute value and subtract the smallest absolute value from the largest. Subtract an integer by adding its opposite. Watch out! The negative of a negative is the opposite positive number.
To subtract two numbers in a cell, type the formula =x-y, x and y are the desired numerical values. For example, if you type =11-4 and press enter, the cell displays the number 7. You can subtract two cells using the same formula as above,by substituting x and y with the cells' column and row headers. For example, enter the formula =B5-B1 and if the number in B5 is 7 and the number in B1 is 3, the cell displays the number 4. Subtract a range of numbers.