First you're going to want to navigate to the Home icon that is on the main screen by using the arrow keys, then once you press enter you will arrive at a different screen and you will be able to enter numbers and symbols at that screen. once you press the appropriate keys for your math problem you will then want to check over that problem and once it is what you want you will then want to press the enter key. The answer should come up. If you do a division problem though, it will just give you a fraction, to get a decimal answer you will then want to press the green diamond key and then the enter key in one extra keystroke to get your final useful answer.