Key shortcuts or command for larger/smaller

I use ctrl+ the number pad to change the point size of fonts. I just got thinking, it would be nice to use the same commands for making the current selection larger or smaller too. Maybe 2 and 8 would be down and up by 1 percent of current size and 4-6 could be 1% of original size. 5 would be 'return to 100% of original size.

And then I thought, if I post it to the forum, one of the other geniuses here would tell me that a command already exists and then I'd know what it is.

So now I wait...