I've taught algebra for 25 years and when it comes to factoring quadratic equations, kids often have trouble testing all the possible factors. It becomes tedious and some kids just give up. The eighth grade that I have now has been playing 24® since 4th grade. I started the lesson and they worked 87 problems with no frustration at all. I pointed out how good they were at this when one of them said "It's just like 24". He was right. A skill that once took weeks to develop took just 2 classes.