Dragon Slayer

I am just curious about the behavior of Math.random(). My question is, why do you need to add 1? For example:

Wouldn't

`Math.floor(Math.random() * 5 + 1);`

Be the same thing as:

`Math.floor(Math.random() * 6);`

?

I am trying to understand the practicality behind adding one to include 5 as opposed to just multiplying by 6.