1.  Which property of addition is represented by the following equation? u + v = v + u 

Hint
Halfnhalf Clue
 

2.  Which property of addition is represented by the following equation? 3 + 0 = 3 
 Halfnhalf Clue
 

3.  What is the missing number? 123 + (456 + 789) = ( + 456) + 789 
 Halfnhalf Clue
 

4.  Which property of addition is represented by the following equation? a + (b + c)=(a + b) + c 
 Halfnhalf Clue
 

5.  Which equation shows the identity property of addition? 
 Halfnhalf Clue
 

6.  Which equation shows the commutative property of addition? 
 Halfnhalf Clue
 

7.  Which property of addition is represented by the following equation? t + 0 = t 
 Halfnhalf Clue
 
