2 fourths is a half.
(Seven eights minus a half) 7 x 8 - 0.5 = 55.5
(Seven eights minus a half) 7/8 - 1/2 = 3/8
3 and 7 eights
7 eights because 1 fourth is equal to 2 eights.
2 1/2
5/8
-1 5/8
2 and 3/8 inches
Converting this to eights, it becomes: 2 eights + 4 eights + 1 eight = 7 eights.
Make lower number the same firstly, so 2/4 times 2 = 4/8 then 7/8 - 4/8 = 3/8
7/8 - 1/2 = 7/8 - 4/8 = 3/8
7/8 - 2/8 = 5/8
If you mean 7/8 minus 1/2 then it is 3/8
7/8 minus 1/2 is 3/8.