Is 2*3 different from 3*2? My answer used to be “But of course! Don’t you know the commutative property?” Now, after following Malke Rosenfeld’s exploration of multiplication, I answer it with a lot more non-committal “it depends“. And I notice more and more examples when even though quantitatively, 3*2=2*3 and 8*1=1*8 and 3*5=5*3, qualitatively you […]
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A few years ago I viewed “The Hundred Languages of Children,” a travelling exhibit about the Reggio Emilia approach to early childhood education. If you’re not familiar with this approach it, among other things, considers the environment (of the classroom and other spaces) as a “third teacher”. Of course, I was drawn to the part of […]
This week’s Math Goggles challenge is a perfect excuse to go out and buy a dozen of freshly baked bagels. At least it was for me. (If you are not sure what is a Math Goggles challenge, read about it here). So the question is what do you get when you slice a bagel. The […]
