|Have you even been adding long columns of numbers like
and half way down the ones column, you lose your place? Boy, that happens to me a lot! Oh, man, was I at 25 or 35? Doh -- need to start all over again.
Scratch addition is a really cool method that keeps you from ever having to add over 19.
It'll seem like a lot of extra work at first... But, that's only because I'm showing you each little step. Once you get it, it's faster than the regular way of keeping track of stuff in your head.
Go on over to the next page and we'll do one!