Reply to FYI: Indiana withdrawing from Common Core standards

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Reply to "FYI: Indiana withdrawing from Common Core standards"

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[quote=Anonymous][quote=Anonymous]
And lest you think this is just a fluke, here is essentially the same standard in the second and third grades:

2.NBT.5: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

3.NBT.2: Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
[/quote]

Also -- what exactly is wrong with teaching kids to add and subtract using "properties of operations"?

Here's are some examples of when it would be quite smart to do so.

(a) 49 + 27 + 1

In the above case, a student could very easily solve the problem mentally, without needing to line the numbers up and use the algorithm, blindly working from left to right or top to bottom.

"9 ones plus 7 ones is 16 ones, plus one one is 17 ones.   Write the 7, carry the 1.   1 and 4 and 2 is 7 in the tens column....."

So much easier to use property of operations, and add 49 and 1 to get 50, then easily add the 20 to get 70, and add the 7.

(b) 33 + 59 – 9

Stupid to add from left to right first, then subtract 9.   Smart to subtract the 9 from 59 first.

Smartest to subtract the 58 from the 58.

Does your "math expert" think the above problems should be better solved using the traditional algorithm, at all times, or would he agree that using knowledge of property of operations could make life (and arithmetic) easier?[/quote]

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