Ok, first you need to know how to find your number. I suggest using your birthdate. You can also use your name (by counting the letters in your name).
It is pretty simple to figure, you don't need a calculator unless you're HORRIBLE at math like me. The most important thing to remember is to simplify your number down to one digit. You do this by adding the two together. For example if the number was 23 you would add 2+3 and get 5. Here, I'll give you an example to follow. It is easier than writing it out.
Use the chart below to figure out your personality traits. Now remember, this isn't super accurate. Just like your astrological sign, believe what you will!