Getting place values of a number w/ modulus?

• I need to get the place value of a random number submitted by a user. This number can by anything from 0-1000000000000000 (zero to one trillion).

• I think this can be achieved by using the JavaScript modulus % operator. The problem, I don't really know how to use it, nor do I understand it.

• Here is the Fiddle.

(All I know is 10%3 returns 1 because 3*3 = 9 and 10-9 = 1)

I figured out the ones, tens, hundreds, and thousands:

var ones = Math.floor(num % 10),
    tens = Math.floor(num / 10 % 10),
    hundreds = Math.floor(num / 100 % 10),
    thousands = Math.floor(num % 10000 / 1000);

I just need:

1. Ten thousands
2. Hundred thousands
3. Millions
4. Ten millions
5. Hundred millions
6. Billions
7. Ten billions
8. Hundred billions
9. Trillions

-- I don't even know if this is possible for the rest, but if you have any hints or find at least one, let me know! Thank you.

        var ones = Math.floor(num % 10),
            tens = Math.floor(num/10 % 10),
            hundreds = Math.floor(num/100 % 10),
            thousands = Math.floor(num/1000 % 10),
            tenThousands = Math.floor(num / 10000 % 10),
            hundredThousands = Math.floor(num / 100000 % 10),
            millions = Math.floor(num / 1000000 % 10),
            tenMillions = Math.floor(num / 10000000 % 10),
            hundredMillions = Math.floor(num / 100000000 % 10);

Managed to get to 100 million.