Well the link to Joanne's site she left here is awesome. I am led to that a lot as I see double or triple digits all the time.
However my answers come from biblical numbers and the Holy Spirit usually leads me there also. So I just go where I am led.
One is Gods number and 5 means re compensate and bountiful in short, but here is the link
Doreen Virtue is good also, it is pretty much the same meanings as Joannes page, however Joanne's page goes into detail more about the numbers.