Whats the problem here your teaching them this and they don't care about it, so they are not learning it. What are they doing texting their bf'/gfs while you are teaching??
Oh I have talked to the parents before...the best 3 replies I have gotten are:"In school he's your problem, out of school he's mine""I can't do the 7th grade math, I'm just a nurse""You don't know what your teaching"