S.K.
www.time4learning.com This program is 20 dollars per month for the first student and 15 for each additional student. It is a full curriculum from pre-k to 8th grade. They can have access to several grades at once. It's always good in the summer to let them back up and go over the previous years math. All programs are a bit different in the way they present the subjects anyway. I'd place them in 7th grade and have them work on it at least 1 hour per day which will be plenty of time for both grades of math if they do only math this summer.