Reply to Why are people so upset about Common Core?

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

Common Core math standards for second grade:

1) A requirement that students understand place value, for instance, that “100 can be thought of as a bundle of ten tens -- called a ‘hundred.’”

2) That students be able to “add and subtract within 1000, using concrete models or drawings and strategies based on place value … and relate the strategy to a written method.” Also that they “understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.”
[b]
3) That they can “explain why addition and subtraction strategies work, using place value and the properties of operations.”[/b]

4) And that they can “represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.”

In general, being able to explain how you arrived at an answer – not just memorizing a formula – is also one of the standards’ key goals for students.[/quote]

OK, you got me there.

Out of 26 2nd grade math standards for 2nd grade, ONE says that students need to be able to explain something.

Using place value,

So why is 27 + 22 = 49?   Because 7 ones and 2 ones are 9 ones, and 2 tens and 2 tens are 4 tens.

using properties of operations

Why does 10 - 7 = 3?

Because 3 and 7 make 10.[/quote]

FAIL!!!!!!!!!!!!!!!!!! That's not the answer. We need at least three sentences on each problem.

[/quote]

Also, WHY does 3 and 7 make 10.  SHOW me that 7 ones and 2 ones are 9 ones. You can say that, but can you SHOW me?

That's the PP's point....[/quote]

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