"Common Core" is one of the main reasons Kat is doing the on-line public school with both kids this year.

Early last year our daughter was really struggling with a math assignment and I couldn't figure out why since she was already very good at the basics. We sat down to go over some subtraction and this is the type of problem we were presented with (this is from Everyday Math aka Chicago Math). http://www.nychold.com/em-arith.html

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I've always been very good at math but I had to look up multiple examples online to figure out what the hell they were doing.