RTif this is how you do math in your head. Trying to see something.https://twitter.com/3nolesfan3/status/910956136844730368 …
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That's the old way, doing it by "place" (one's place, ten's place, etc.)
Common core is saying, "it takes 4 to go from 26 to 30, we take that from the 17, now there's 13 there, so now i have 30 + 13, that's 43."
26+4=30, 17-4=13, 30+13=43. It’s literally what I did except splitting up the 7 I added to 26 in two.
All addition is literally equivalent because it's working in the same group. It's a matter of mental bookkeeping. That's all.
Ya agreed. Common core is just a slightly different way of bookkeeping.
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