I just showed it to DD10 who did said that she learned how to do this during the AOPS Pre-Algebra class which she took last year. Knowing how to do this by the end of 6th grade sounds about right given that the AoPS class describes itself ( or used to before Common Core) as an adequate 6th curriculum.

Last edited by madeinuk; 03/18/15 06:34 PM.
Become what you are