There are 6 numbers on a normal dice. what is the probability that if you roll the dice, you'll get a number less than 5?

There are six numbers on a dice (6 out of 6). 
There are 4 numbers on a dice that are below 5 (4 out of 6)
So there is a 4 out of 6 chance (4/6) that you will roll a number less than 5.