How do you say 1.5 in English?

There are a few ways to say 1.5 in English, depending on the context:

Formal:

* One point five

* One and a half

Informal:

* One and a half

* One point five

* One fifty

Other options:

* One and a half (This is the most common and natural way to say it in everyday speech)

* One point five zero (This is more precise but less common)

* One five (This is acceptable if the context makes it clear you're talking about a number, but it can be ambiguous)

The best way to say it depends on the situation and your audience.