I would keep reading him the instructions and word problems. If reading is hard for him and he likes math, then let math be his "easy" work. Please don't make his love of math wane by forcing him to read it. And it will if reading feels like too much work. He'll catch up with reading and be reading those problems soon enough. I have a 9 year old who is just now catching on to reading, but has been and still can be successful in math because I read it to him.