This is pretty simple. Just press the spinner and see your luck.
This is supposed to be maths, I don’t know what I was thinking at the time, I guess the addition and subtraction. P.S. This was a school project, I didn’t get much time to do it. Thanks to @BattleDroid for working with me on this one a long time ago. It isn’t perfect, let me know if you have possible improvements, please enjoy and follow