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

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]
That should be exactly what she knows and has learned in school.  Once you know the terminology, it is very simple.  Doubles are 4+4, 5+5, etc., which most children learn easily and before other math facts.  Counting on, or count plus one, is 4+1, 5+1, etc., which is simply counting one more number.  So a double plus one is another way of adding 4+5, by breaking it up into 4+4+1, which is easier for some children.   [/quote]

But why make kids memorize doubles?  Why fill their heads with unnecessary terms and strategies?  What exactly this whole "double" concept is for? It's useless for additions and useless for multiplication.  In multiplication are you going to say to your kids "Doubles times three?"

I came a very strong school of math.  And anything that wasn't the shortest, most elegant solution was not accepted in  my math classes.[/quote]

Doubles are very handy.  Once you know 5+5 is 10, it makes it easier to figure out that 5+4 is 9 and 5+6 is 11 simply by subtracting or adding 1.  Thus, by memorizing one fact you can leverage that knowledge to know three facts.  Saxon math, which is not exactly a well of new math gone crazy, has children learn doubles very early on for this very reason.[/quote]

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