Is 4.50 the same as 4 and half hours?

Answer 1

Note that you wrote 4.50 without any units. To be the same it would have to be - 4.50 hours or 4.5 hours.

If written as 4:50 it is 4 hours 50 minutes. To have 4 1/2 hours it would be 4 hours & 30 minutes, or 4:30 (because 30 minutes is half of 60 minutes [which is 1 hour])