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Building Castles with Mathematics

​Andrea McCabe Written by ​Andrea McCabe
Building Castles with Mathematics

How do you approach the problem 42×51? I think most of us will grab our crenelated pail and multiply 2x1, 4x1, add a place holder zero, etc. The answer is 2,142. We were taught this method early and probably don’t even consider other ways to solve the problem. There is a tidy simplicity to this method. But (you were expecting me to say that!), what if we were to consider the same problem written a different way?

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