3/8 and 13/8 are two fractions.
common denominator of eight and nine
A common denominator of 6, 8 and 10 is 480. This is NOT the least common denominator, though.
24
1
24
168.
8
280
Eighty-eight is the least common denominator of these three numbers (if they aren't whole numbers; then it's just one).
Fourteenths (eight and seven)
180
63