Answer:
Commutative property of addition.
Explanation:
Given : 6+7=7+6
To find : Underline the addition property .
Solution : We have given 6+7=7+6
Commutative property of addition : a + b = b +a
Example: 2 +3 = 3+2 = 5.
We can say 6+7=7+6 follow the Commutative property of addition.
Therefore, Commutative property of addition.