It is possible to teach math to this population, I've done it briefly when I was a teacher in an adult education school. It's significantly slower than for ave

It is possible to teach math to this population, I've done it briefly when I was a teacher in an adult education school. It's significantly slower than for average people and requires a ridiculous amount of effort on the part of the teacher and student, but it's possible. Due to limited working memory many of these students will make mistake no matter how difficult the material is, and they will be slow at resolving problems, but I've never had a student without serious mental health issues be unable to get to precalculus level, and in the ones I've seen try they've been able to get to university math. Again, many will always make more mistakes and/or be slow, but the concepts themselves are generally within grasp.