Challenge Math is a great way to prevent summer learning loss of math skills for children in grades 2-6. It is a very inexpensive way of brushing up your child’s math problem solving skills during summer. It takes very little time commitment and has flexible schedule. Check out their website.
https://www.noetic-learning.com/gifted/index.jsp
Read more about Challenge Math on my previous post here.
Smitha's 2 cents worth 