1. © 2007 M. Tallman

2. Commutative Property

3. © 2007 M. Tallman The order of the addends does not change the sum. 8 53 + = addends sum 5 + 3 = 3 + 5

4. © 2007 M. Tallman =5+38 8=3+5

5. Commutative Property Associative Property

6. © 2007 M. Tallman The way the addends are grouped does not change the sum. In math, parentheses are used to group numbers. They tell us which part of the problem to solve first. = 9 2 4 + + 3 ( ) (3 + 2) + 4 = 3 + (2 + 4)

7. © 2007 M. Tallman 9 (3+2)+4 = =9 (3+2)+4

8. Commutative Property Associative Property Identity Property

9. © 2007 M. Tallman The sum of any number and 0 equals the number. 11 + 0 = 11

10. =11+0

11. © 2007 M. Tallman

12. 9 + 7 = 7 + 9

13. © 2007 M. Tallman 2 + (6 + 8) = (2 + 6) + 8

14. © 2007 M. Tallman 17 + 0 = 17

15. © 2007 M. Tallman (10 + 4) + 5 = 10 + (4 + 5)

16. 3 + 0 = 3

17. © 2007 M. Tallman 19 + 5 = 5 + 19

18. © 2007 M. Tallman 6 + 9 = 9 + 6

19. © 2007 M. Tallman 3 + (5 + 6) = (3 + 5) + 6

20. © 2007 M. Tallman 0 + 345 = 345