You can use Polydojo forms to perform a large variety of on-the-fly calculations.
For starters, let's simply add two numbers.
X(in caps) and click 'Done'.
X + Y(in caps); and finally click 'Done'.
That is it! Your form will now automatically add two numbers! Let's check it out.
Now instead of
X + Y, you could've set Expression to:
X - Y(Subtraction)
X / Y(Division)
X * Y(Multiplication)
X*X + Y*Y(Sum Of Squares)
You could add another 'Number' field labeled 'Enter Z', with variable
Z (in caps). Then, you could use compound expressions such as:
X * (Y + Z)(Add, then multiply)
(X + Y + Z) / 3(Average)
X * (1 - 10/100)or
X * 0.90(10% Off)
Y * (1 + 18/100)or
X * 1.18(18% extra, for tax etc.)