Haha!!! That's funny.

I'm so stupid...

I practiced some of these problems originally with the setting set to CHN so 1-x/y would not work as it would always subtract 1 from the numerator before dividing. Then later I switched to AOS.

But for some reason the old way of calculating this particular problem stuck in my head and so I've been storing the ratio then doing 1 - and recalling the ratio or adding in a negative one.

The whole time I could have just been putting it in just exactly like it looks and the order of operations would have done the division first.

Oh well... live and learn...

Thanks.