Okay, so I know how to round a number to the nearest 0.5 by multiplying it by 2, rounding it, then dividing by 2 again.

I’ve figured out that doing the same my 4, instead of 2, gives me the nearest .25.

What I need, though, is to round it to the nearest .5, but at an offset of .25.

So, instead of all numbers ending in .0 or .5, they should all end in .25 or .75

I can’t figure out the maths for this.

I know I can just add .25 to push it up, but that’s not quite what I need.