xtramath
Your child's teacher may have set up an account for your child, but if not you can set up an account on xtramath for free. You just need to provide your email. The website will send you occasional updates on your child's progress. I have found this to be a helpful site both as a teacher and as a parent as we work to have children gain fluency on adding, subtracting, multiplying and dividing. I suggest that students get on the site between 3 and 5 times per week in order to see steady progress.