I am talking about the method to find how much you rounded up. It is taught right to left.

Also, could you add geometric and trig functions to your backlog if you want to.

The post helped for 3, but not 4.

Another question, if numbers get large (e.g. 169,523), how could you multiply them with another large number using the UT, Bridge, or Virtuvian Man method, with very little mental stress?

That is all I have to say. Happy holidays!