Name the property being illustrated:
1. 9+27=36
2. 2•7=7•2
3. 4 • (2 + 7) =8 + 28
4. 6 + (-6) = 0 ;identity
5. 14 • 1 = 14
6. 23 + 13 = 13 + 23
7. 10 • (1/10) = 1
