It's a proven fact that kids lose skills and fall back several months over the summer. While it might not be needed daily, refreshing every so often is never a bad idea. Our school actually gives the kids a math book that is a refresher for the summer to stay current and some of the teachers give a summer packet. It's not for a grade in the lower grades but they do have to show that they did it when school is back in session. the older kids may get graded on in it. I love that idea. I was thrilled to get something for the kids to work on over the summer! Why not make it fun and do computer math games to brush up on facts in your case. It's educational fun and that's the best kind you can get. Just my 2 cents