math.random question

I have a fairly simple question:

Please explain the following based on this:

Math.floor(Math.random()*5+1);  -- I understand this gives me a random number from 0 up to and including 5.

why is math.floor needed?
why is 5+1 needed instead of just 6?
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MontoyaProcess Improvement MgrAsked:
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To make sure its a whole number and not something like 2.56584
.floor rounds down to the nearest whole number
.ceil rounds up to the nearest whole number
MontoyaProcess Improvement MgrAuthor Commented:
why is 5+1 needed instead of just 6?
It's not 5+1 its
Math.random()*5 and then add 1

And it will be a random number between 1 and 5 not between 0 and 5
If you do want it between 0 and 5 then remove the +1

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