MathFoundations13: Rational numbers

[relike868p]

It would not be hard if high school students were taught abstract algebra....

[RoseHerlin]

I don't get it..

[hannan4564]

very difficult lecturer

[likeprestige]

@hannan4564 He's offering the outline of a wall. It's our job to work-out (with a bit of independent research & study) how all the bricks fit in order to build the wall. It's too time consuming to go into detail, he's trying to cover a whole program.

Thanks nj!

[thekkl]

I don't understand:

It says that in the case of M less N, if N is bigger than M (as in 1 less 2) that together they are equal to negative N minus M. If that was the case, wouldn't 1 less 2 be equal to negative 3?