This is a calculator 1: Press the green flag 2: Set numbers: click on "set 1st/2nd number" and enter the number. 3: Select the operation, 4: press AC (all clear) to reset NB: square root, lin, log, sin, cos and tan works only on the second number.
If you don't know what is the point, it's one of two symbol of the multiplication, and the"^" is the symbol of the power
