With Apple Numbers, you can also perform other key formulas such as finding the average, minimum, and product of your spreadsheet values. Click on the Cell icon on the lower right side of the screen and under Quick Formulas, select Sum. Once you have listed and arranged your values, select all or specific ones that you want to add. These may be expenses, quotas, quantities, or whatever your specific spreadsheet requirements are. The first step is to input your values or numbers. You cannot use the add or subtract function in Apple Pages with a blank cell or spreadsheet. Follow these simple steps and learn how to use Apple Numbers’ addition and subtraction functions. In Apple Numbers, you do not have to manually add or subtract values and numbers.