My initial reaction when the video started was..... seriously?
But soon after I realized what the teacher was trying to accomplish and he accomplished it quite effectively. One of the parts that stuck out to me was when he introduced the negative numbers. Tapping on the board from right to left, he went from 3,2,1,0,-1,-2,-3. The students seemed to comprehend that. However, shortly after that he started at -6 and then tapped the stick to the right. Some students mumbled out -7, and some students mumbled out -5. It is easy to see why students would get confused because it's hard for them to comprehend that -7 isn't actually greater than -6. That moment, I think, really cemented what a number line was and how it worked.
It was interesting to me because he introduced so many mathematical concepts(number line, negative numbers, preliminary algebra) with only using the ability to count, and barely speaking at all. Pretty much any student of any level could comprehend what was being taught.
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