Cool Math Stuff

Since this is the last post of 2012, I thought I'd finish the year with a mental math technique. Before I do that though, I want to show...

I have been trying lately to keep my posts with less algebraic thinking than they have been, and more simple ideas and patterns. There is st...

Today is another triangular day! It is the fifteenth of December and 15 is the fifth triangular number. Two weeks ago, I talked about how ...

A couple weeks ago, we discussed the Criss-Cross Method for multiplication as a way to make it much easier when we get into larger numbers. ...

Happy December, and happy triangular day! It is the first of December, and one is the first triangular number. One is also a square number, ...