This calculator only + numbers. Press green flag to start •On the screen there are 3 variables shown, number one, number two and total. •Enter one number as it asks you and then a second one. •It will add them together and tell you the total right after. (If you put a word, letter, symbol, etc (at both number one and two) it will make the total 0.) If you put a letter at only one of them it will put the total of the actual number that you put.