Thursday, April 11, 2013

Decomposing or Splitting?

I was watching a wonderful video on the Teaching Channel the other day.  In it, the teacher was asking the children to solve an addition equation using a strategy other than the traditional algorithm.  As I was watching, I noticed that she had "math talk" posters under her white board with scripts to encourage conversations using mathematical language.  I took particular notice of 2 of them; one about decomposing a number and one about splitting a number. As the kids shared a strategy, the teacher pointed out that whether  the numbers were being decomposed or split.  She made the distinction that when you decompose a number, you are breaking it apart into its expanded form and when you are splitting a number you are breaking it apart in any way that makes it easier to work with.  The following are some examples of the scripts I saw.  The kids would fill in the blanks with the appropriate info:
I think ___________________________ because _____________.
I agree/disagree with _______ because  ____________.
I got ________.  I used groups of ten.  I started with ______.  I knew that _____________.
I got ________.  I used decomposition.  I broke ____ into ____ and _____.  Then I  __________.
I got ________.  I used splitting.  I split ____ into ____ and ______.  Then I ______.
Be sure to check out the great videos on the Teaching Channel!

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