Number Sense – Factoring

Loved this post from Don Steward, offering these number puzzles:

Picture1

Really enjoyed playing with these– they have some fascinating properties and can be solved efficiently only through a pretty deep understanding of prime factorizations. It’s one of those topics that students tend to either “get” early on, or they memorize it and forget it in 6th grade. I’m curious what other parts of math this type of thinking supports.

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