Go over your child's classwork and homework together. Reviewing their work will help you stay up to speed on what's going on at school. Education is an important part of your child's life. By showing an interest in school, conveys to your child that you geniunely care.
If your child is homeschooled, try reviewing the material with your child in a different atmosphere or format. Go outside and review what you discussed about photosynthesis. If you read excerpts from a book - check to see if there is a movie based on the book or a play.