float Percentage ;
int CountFalsed = 0;
int Falsed = 0;

Percentage = ( (1-0) /121) /1; // means if everything is true I'm giving 0.008% to each 121 slot if it's falsed I'm giving more %
Debug.Log("" + Percentage);

I went so far to the obvious

Percentage = (1/2);

returned me same 0

but when I give it

Percentage = (2/1);

returns me 2 at last …

Percentage = (2*0.5);

gives me 1 at last

what’s the calculation I do not understand here?!?!?

Because you divide with integer values so it’s an integer division. An integer division always returns an integer. the fractional part is always trucated. So 1 / 2 = 0.5 → 0

You need to use float values. When you divide by constant numbers use a float literal:

int V = 10;
float P = V / 100.0f; // P will be 0.1f

If you want to divide two integers and want a fractional part you have to cast one of the operands into a float:

int V = 10;
int D = 100;
float P1 = V / D; // P1 will be 0.0f
float P2 = (float)V / D; // P2 will be 0.1f