1 + 7 = 7 + 1 2 + 6 = 6 + 2 3 + 4 = 4 + 3 4 + 5 = 5 + 4 6 + 3 = 3 + 6 7 + 2 = 2 + 7 8 + 1 = 1 + 8 9 + 0 = 0 + 9
Copyright ©
2001-2011
Oswego City School District |
1 + 7 = 7 + 1 2 + 6 = 6 + 2 3 + 4 = 4 + 3 4 + 5 = 5 + 4 6 + 3 = 3 + 6 7 + 2 = 2 + 7 8 + 1 = 1 + 8 9 + 0 = 0 + 9
Copyright ©
2001-2011
Oswego City School District |
The
commutative property of addition tells us
that the order in which 2 numbers are added does not change the sum of
those 2 numbers. In the earliest level we can also predict that
the objects in two sets will give the same sum when combined regardless
of which items we count first. Examples of this property follow.
+
= 
+
= 
