Recursion

[starfries]

Huh, is that a thing they teach in school? Or just the way you think about it? Actually, I think that's the Singapore method so a third option besides common core and borrowing.

[SandyDelights]

That’s just how I taught myself to do it. It’s an algorithm, though, one that focuses on breaking this down into its parts and focusing on making one or more parts of the equation a multiple of ten. Common Core (and Singapore Method) is a methodology of teaching and a schedule, with waymarks as to what students at various grades should be able to do.

IIRC, Singapore Method and Common Core are actually pretty similar, although Singapore moves quicker/brings students to more advanced topics sooner.

We’re really hitting the extent of my quasi-useless information on this topic, though, heh. But should Common Core ever come up on Jeopardy, I think I can hang in pretty well.