1. We had to wait for 1 1/2 hour.
= We had to wait for one and a half hours. (or: an hour and a half)
Note that after “one and a half”, the noun is plural:
- one and a half kilos
- one and a half kilometers
- one and a half pounds
- one and a half inches
2. Hurry up! The bus leaves in 1/4 of an hour.
= Hurry up! The bus leaves in a quarter of an hour. (1/4 of an hour = 15 minutes)
3. Can I please have 2/3 of a pound of ground beef?
= Can I please have two-thirds of a pound of ground beef?
Note that in English grammar, ordinal numbers are countable, so when the figure on the top of the fraction is bigger than one, you need to add an -s at the end of the figure on the bottom of the fraction.
I hope after reading my lesson, you will be able to read fractions and spell them out in written English correctly.