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🎩.artlu.eth👃- 呂Kunst
@artlu
American math education has changed, 2-digit by 2-digit multiplication. 66 x 22 step 1: write 66 x 2 as 122 with a little 1 over the middle 2 step 2: write 66 x 20 as 1,220 with a little 1 over the first 2 step 3: write final answer as 1,452 by adding up the columns
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Matt Bateman
@matt
Wait where are the little 1s coming from
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🎩.artlu.eth👃- 呂Kunst
@artlu
it's the "carry the 1", so instead of writing 132, they write 122 with a little 1 on top of the middle 2. they can always work left-to-right, and don't have to remember any numbers in their head
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🎩.artlu.eth👃- 呂Kunst
@artlu
given your background, is it surprising to have me describe it this way? like I said, it totally triggered me to see a "wrong" intermediate step written down on the paper. I'm sharing here, kind of wondering if this is unique to my kid's school's math curriculum
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Matt Bateman
@matt
I’ve taught it a number of different ways and I don’t think it generally matters all *that* much, but there’s something about how you’re describing it that isn’t clicking I prefer the Montessori checkerboard for various reasons, then branching out to other tricks
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🎩.artlu.eth👃- 呂Kunst
@artlu
curriculum is called Eureka Math2. Here's the explanation, should be more clearly written than what I cast above lol
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