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Q&A #4348

Teachers' Lounge Discussion: Decomposing numbers

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From: Ashley <lilcheerbabe@hotmail.com>
To: Teacher2Teacher Public Discussion
Date: 2007100316:25:30
Subject: re: decomposing numbers

 From my understanding it means to break the numbers down so that it is
easier for children to add. For example 5+8. You would break the 5
down into 2 and 3. Then you add 8+2= 10+3= 13. When possible children
should use this to get to 10, which then makes it easier to continue
adding. Another example is 12+13. Break 12 into 10 and 2 and 13 into
10 and 3. Add 10+10= 20. 2+3=5. 20+5= 25. Hope this helps!

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