The TEACHER is TEACHING it to grade school students?? Obviously you're gonna be faster????https://twitter.com/GregNorberg/status/1133580446246232064 …
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From a computational standpoint, clearly, the method on the left is inefficient, not stupid. However, from a conceptual standpoint, it shows the connection between multiplication (algebraic)and area (geometric). For the intended audience, this is very important!
