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

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]but you might use doubles to solve 47+58: Break down 58 into 3+50+5 and then combine 47+3 to get 50, use doubles to get 50+50=100, then add the 5 to get the answer of 105.[/quote]

My math teacher would be appalled at such a clumsy, inefficient, ridiculous solution.  I'd get a C for this in best case scenario.
But in CC worksheets this kind of math is acceptable. That's the problem with the curriculum.  This is an example of CC I found on Reddit:

[/quote][/quote]

Then your math teacher would be a bad math teacher. Anybody can memorize an algorithm. But if you don't understand what you're doing, it's just a mathemagic formula.

There are lots of different ways to do 47 + 58, in addition to the standard algorithm (47 on top of 58, 7 + 8 is 15, write 5 below the line in the ones column and put 1 on top of the tens column, 4 + 5 + 1 is 10, write 10 below the line in the tens column, the answer is 105). For example:

40 + 50 + 7 + 8
47 + 3 + 55
58 + 2 + 45

What's more, those are not actually "clumsy, inefficient" solutions. They're good ways to solve 47 + 58 mentally, without paper and pencil.[/quote]

This. These strategies are mental math tricks. Highly effective in understanding numbers. Countries who do well on PISA tend to emphasize these a lot more. I grew up in China and did all sorts of calculations like this. [/quote]

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