That’s how I do math in my head...
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The way on the left? Okay, it's interesting how polarizing the responses are to one way or the other. That's kinda why I posted this, I wanted to see what everyone thinks, or how they do it!
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And writing it out like you have here really shows how the method is the same as FOILing, which everyone learns in algebra. That’s a strength of this I think. And seeing it graphically helps some kids. Teaching underlying concepts multiple ways is always a pro for kids
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Personally I’m against teaching FOILing, but I’m not as against it as pure algorithms
End of conversation
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I dont remember how I learned but what I do is 35(10+2) which i find quite easy. I think they made us memorize ab×c tables early.
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When you write it this way my brain understands what is happening better...
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Wouldnt 35*10 + 35*2 be even faster?
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That's how mental calculators do, like Arthur Benjamin, except with larger blocks. I also do it that way, but try to simplify things at the same time. For example: 35x12 = 70x6.
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Now that you wrote it out that way I can see how that would make it easier to understand algebra in the future
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