15 minutes is 1/4 of an hour.
15 minutes is one quarter of an hour or 1/4 or one fourth.
A fraction is one part of a whole. A whole hour has 60 minutes, so 15 minutes as a fraction of an hour is 15/60 = 1/4 or 0.25 of an hour.
15 minutes is a 25% of an hour.
Jamal goes to football practice at 6:15 pm, write the time in words using fraction of an hour