If you don't mind going digital, Edmodo is a social network that my school used to use.
It's like an educational Facebook, but secure--you need a teacher-provided code to join a 'class'.
-There are mini-games about fractions and such if I remember correctly.
-Like I said, it can be used socially, but if you want, you (the teacher) can create quizzes or 'bell ringers'.
As a twice-exceptional student (I have Asperger's), I can say that this site helped my social skills a lot.
PS: Sorry if this sounded like an ad. I'm not affiliated with the site--I just like it a lot.
edmodo.com
Also, it's free, or at least it used to be; I tried to make a group for my book club once (to summarize, you actually have to be a teacher...) and I didn't have to pay anything. I'm pretty sure nothing changed since then!