When Scratch Cat tells you what he can help you with, type in your answer exactly as shown on screen. (For example, if you want to find out the area of a square, you have to type in Area Of Squares.) Click the red button to the right of the green flag to stop the music and the program. Your input on Addition, Subtraction, Multiplication, Division, Square Roots, and Area Of Squares HAS to be a NUMBER. Otherwise, Scratch Cat will say that the answer is NaN, or Not A Number, and the program will stop. Negative numbers are not accepted.
I used code from @helbonikster for the area of squares function.
