The thread following this tweet is fascinating. https://twitter.com/CandiLissa/status/518495925619007488 …
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@St_Rev It's similar to way I add numbers, so common core planners might have observed their own thoughts and decided to teach it. -
@Watercressed Ah, possible. -
@St_Rev@Watercressed That's exactly what it is, "make ten" & then +/- remainder. Singapore Math curric & others teach this for mental math
End of conversation
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.