RTif this is how you do math in your head. Trying to see something.https://twitter.com/3nolesfan3/status/910956136844730368 …
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20 + 10 = 30 7 + 6 = 13 30 + 13 = 43 I go for the decimal, 10 fingers, 10 toes. Then for addition under 20 my brain has dedicated CPU adder
I borrow 4 from the 17 to make one a multiple of 10.so (26+4)+13 so 30+13. adding a teen to a multiple of 10 feels easy so don’t break down
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