Assuming you start with 3/8 and count by 3/8, the next number would be 6/8 = 3/4.
Three eights of a number (x) is x 3/8.
1/2
3.75
96
if 4 and eight eights is subtracted by 3 and three eights, then you get 1 and five eights
Converting all to eights, it gives three eights minus six eights, so the answer is minus three eights.
53/8 = 5.375
37 and 1/2
9
4 and three eights.
Three Eights
three eights