At some point, your child is going to have to learn to do his or her homework alone. While you should still check it and make sure the answers are correct, stop hovering while he’s working. If he asks for help, fine, then give it. Be available, but not overbearing.
If you find that each and every night you are getting into fights and tantrums with your child over math homework, it’s time to throw in the towel and ask for help. Either hire a tutor or find a friend (or spouse!) to take over the homework help job, even for a few days. Sometimes a fresh perspective is all it takes.
Finally, just know that learning math is like anything. It takes practice, practice, practice. If your child has a hard time with one concept, don’t yell or cajole or act disappointed. Don’t accuse your child of not listening. Sometimes math really is hard to understand, and sometimes children just have trouble grasping certain concepts. That’s okay. Tell your child (and yourself) that mastery will come, that it just takes time. You and your child can do it!