[metmom]

I thought 6=3+3 thanks for clearing that up

Really, she just Happened to pick 1+5 which works really well for that problem.

What if the kids picks 2+4 or 3+3? Or 5+1? THose kids would be in a tail spin if they put the numbers in the wrong order. They're in a world of hurt.

And even at that point, they have to have some math facts memorized to know all the possibilities and pick the right one to make a *complicated* problem like 9+6 work.

The idiots are basing their problem solving on prior knowledge and memorized facts and don't even seem to realize it.

[Tired of Taxes]

I noticed in the video that the teacher used the same symbolism used in "factorization" for her Common Core addition.

That is, aren't children still taught "factor trees" for multiplication:

6
/ \
6 1

The teacher used it for addition:

6
/ \
1 5

That alone might confuse the younger children.

[Labyrinthos]

What if the kids picks 2+4 or 3+3? Or 5+1? THose kids would be in a tail spin if they put the numbers in the wrong order. They're in a world of hurt.

Every school, teacher, and student already has all the tools they need to understand what CC is trying to achieve at that level without the added and unnecessary complications. I see nothing wrong with using fingers and toes to teach these concepts. Peanuts and small stones work just as well.

[Ray76]

I think this is their method:

1. find the difference between the first addend and 10
2. subtract that difference from the second addend
3. add that difference to 10

An example

9 + 6 = 15

10 - 9 = 1 (find the difference between the first addend and 10)
6 - 1 = 5 (subtract that difference from the second addend)
10 + 5 = 15 (add that difference to 10)

Applying that method to another example

8 + 7 = 15

10 - 8 = 2
7 - 2 = 5
10 + 5 = 15

It’s incredibly inefficient. One addition operation is replaced with two subtraction and one addition operation. What will they do when they get to three digit numbers, or eight digit numbers, etc?

Common Core is sinister.