Damon does the following math problem:

4 · 7 ·

4 · · 7

1 · 7

7

Damon has used all of the following number properties except _____.
4 x 7 x 1/4
4 x 1/4 x 7
1 x 7
7
distributive property
multiplicative identity
multiplicative inverse
commutative property of multiplication