its works just like a regular calculator. click the green flag to start then click the numbers you want to use with the symbols and click equal to see the answer in the black text. the answer has to be less than 8 digits long
Chrischb made this, not me. I just changed the graphics a bit to make this a little better in my opinion but the full credit goes to chrischb. you can click his name or his original project to see it.