$2\ +\ 9\ =\ 11$  
 $9\ +\ 2\ =\ 11$   

• Associative Property

• Identity or Zero Property

• Commutative Property

 $24\ +\ 0\ =\ 24$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $\left(12+4\right)\ +\ 6\ =\ 22$  
 $12\ +\ \left(4+6\right)\ =\ 22$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $15\ +\ 20\ =\ 35$  

 $20\ +\ 15\ =\ 35$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $10\ +\ \left(3+15\right)\ =\ 28$  
 $\left(10+3\right)\ +\ 15\ =\ 28$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $0\ +\ 100\ =\ 100$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $\left(9\ +\ 18\right)\ +\ 12\ =\ 39$  

 $9\ +\ \left(18+12\right)\ =\ 39$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $68\ +\ 0\ =\ 68$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $45\ +\ 15\ =\ 60$  

 $15\ +\ 45\ =\ 60$  

• Associative Property

• Identity or Zero Property

• Commutative Property

 $\left(22\ +\ 8\right)\ +\ 16\ =\ 46$  
 $22\ +\ \left(8+16\right)\ =\ 46$  

• Associative Property

• Identity or Zero Property

• Commutative Property