I would just start with one operator at a time, I think thi…

I would just start with one operator at a time, I think this happens naturally anyway, once I start doing addition, I end up not doing any other ones... on track mind. maybe do multiple operators after going through them independently? so maybe like 2-3 levels of addition, 2-3 subtraction, etc... I would at least try it to see how it feels. That would also limit the 0 hack and any solutions just to the multiplication levels.
Again just my opinion, it could totally be wrong, only playing it will show.