7 1/2 is equivalent to 7 3/6
7x6=42
so 45/6 - 5/6
45 - 5 = 40
40/6
or, in mixed number form, 6 4/6, which can be simplified to 6 2/3
7 1/2 is equivalent to 7 3/6
7x6=42
so 45/6 - 5/6
45 - 5 = 40
40/6
or, in mixed number form, 6 4/6, which can be simplified to 6 2/3