Quote Originally Posted by S.I.R. View Post
I try to break it down by a basic 10%. 270 is 10% of 2700 and then just add 270 to 270 = 540. Kinda weird I know, but I do a lot of math in my head and I always try to break it down as simple as possible.
I do the same thing. Move over the decimal point and then add.

If youre doing this to figure out what size rat to feed, dont go by that rule.