Beginner cast-on methods

[untonuggan]

I've been teaching my mom to knit, and she's got knitting/purling down pretty well. She's still struggling with casting on, though. I tend to use the double-stranded cast on (since it's the first one I learned and it works). However, she has weak hands and has been trouble coordinating everything.

What's a really simple, easy cast-on to teach a beginner? At this point it doesn't have to be super-stretchy or look amazing, but those things would be nice, too.

Thanks!