Reply to No doing well with Common Core, but we'll with Singapore math

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]

Actually doubles aren't even mentioned as a term, in Common Core.   This is what is stated as an objective for first grade, which is where you'd expect the concept of doubles and doubles plus one to be taught:

http://www.corestandards.org/Math/Content/1/OA/

CCSS.MATH.CONTENT.1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

Use strategies such as [b]counting on[/b]; [b]making ten[/b] (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); [b]decomposing a number leading to a ten [/b](e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); [b]using the relationship between addition and subtraction[/b] (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating [b]equivalent but easier[/b] or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).[/quote]

I don't get it. Doubles and doubles + 1 are right there. What did you mean when you said they're not in CC?[/quote]

"Equivalent but easier or known sums" could be doubles but doesn't have to be doubles. It could be also be (for example) 7 + 5 = 7 + 4 + 1 if the child knows 7 + 4 but not 7 + 5.[/quote]

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