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Number Sense and Numeration Lesson 2 - Turn Around Addition
by Elaine Ernst Schneider

 Objective(s): By the end of this lesson the student will be able to:  1. remember this rule of operations:  Addition and Multiplication can Always be Mixed up. For Subtraction and Division, Same order is Desired. Note to teacher, parent, or tutor: These problems demonstrate the associative property of addition. The property is also true of multiplication.  Teaching this as a foundational truth now will facilitate pre-algebra concepts that your child will meet with in the future.

Outline:

Did you know that if you add 4, 3 and 2, it is the same as adding 3, 4 and 2 or 2, 3 and 4? You can turn the numbers around any way that you like in addition!

4                 3                   2
3                 4                   3
+2               +2                +4
9                 9                   9

When you add, you can mix the order of the numbers all around and you will get the same answer. Let’s try some more problems.

 5 6 2 2 5 6 +6 +2 +5 . . . . 2 7 4 4 2 7 +7 +4 +2 . . . . 8 3 2 2 8 3 +3 +2 +8

 Submitted by:  © Elaine Ernst Schneider  is a freelance writer and a teacher. She has been writing since high school and has published articles, songs, and children's work. Presently, Elaine is a curriculum author for Group Publishing and also writes the City Songs column for www.newcolonist.com ezine.
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