Show positive interest in the work. Do it in a positive way and it will be helpful. Be sure to have your child read daily to you each story assigned. Try to read each at least twice. Usually the child enjoys reading, so be sure to remind him that you want to hear the stories.
Memory work is taught and drilled in class, but be sure to check up on it at home.
Please spend more time on this, if necessary. You can help a lot with math by drilling math facts using flash cards. If your child really knows the facts, much time will be saved and aggravation will be avoided. They do accept most things at face value. Fourth graders will begin to question authority.