I’m not a lone critic of the push to have elementary schools adopt constructivist math instruction like TERC (pronounced "turk") Investigations or Everyday Mathematics as a replacement for traditional multiplication and division instruction.
Take a look at a few demonstration samples of what I’m talking about:
- (Circle Parts Method) http://youtube.com/watch?v=0GlIx5pztpM
- (Stick Method) http://youtube.com/watch?v=-Jn18MBeibA
- (Lattice Method) http://youtube.com/watch?v=R6uiz8YdA7w
Can you readily explain how and/or why these methods work at a level I can use for 4rd graders?
Frankly, learning a method without understanding the “how” or more importantly, the “why” is just as cryptic as the one “Ma&Pa Kettle” demonstrates for us:
Although, I did find this one has potential if it can be demonstrated as reliable and repeatable:
(Calculator method) http://youtube.com/watch?v=owMjAbkU1eE