Simple drawing powerful math concepts:
Here they are counting up the parts...
Here we see that they had forgotten their addends for 7 and 9...no big deal just go back and build a bunch of 7's and 9's and all the other ones too...here they are building 7's and they knocked it over and built it again about five or six times...
The House of Math on FaceBook.
The House of Math
Learn a lot of algebra for a buck.
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