8*7/10 = 56/10 = 5.6 eighths
This is closest to 6 tenths in units or 6-1/4 tenths if fractions are allowed.
6
78 sixteenths
1
1.25 tenths of an inch.
8
1
6 7's
There seven eights in 56.
Seven is the number of eights you are seeking.
10......
There are ten tenths in anything.