1. Associative Property of Addition
Objective: Define the Associative Property of Addition.

2. How many shapes are there?

3. = + + = 5 blue shapes 4 red shapes 9 shapes 2 squares 7 triangles

4. Associative Property of Addition
The grouping of addends does not change the sum.
15 ¢
1 ¢ +
10 ¢
6 ¢ + =

5. ( 5 + 7 ) + 8 5 + ( 7 + 8 ) Parentheses are used to group addends.
5 + ( )
I know 7 and 8 is 15.
= 20
( ) + 8
I know 5 and 7 is 12.
= 20
The Associative Property of Addition allows us to group the addends any way we like.