Math can be a difficult subject. I know many ESL teachers who are wary of assisting ESL students with math, as they weren't A+ math students in high school themselves.
Here are two websites that may help. They feature video tutorials that can help teach math concepts. This is a great website to share with students, so they can use it at home or at their local library if they are stuck on their homework or need extra review.
Though videos aren't always as effective as a teacher sitting beside the student, at times it is the best option--and it can be paused and watched again!
I hope you find these helpful:
