Summer learning is so critical, especially for students who are already struggling. I've been working with a peer tutoring group this year (5th graders tutoring 3rd graders), and I wanted to give them a gift for completing the program. I bought each of the students a deck of cards, and my idea was to create a booklet to give them containing instructions for easy math games they could play using the cards. In scouring the Internet for ideas, I came across the website of an organization called the Positive Engagement Project (PEP). It's a nonprofit organization whose mission is "To get students positively engaged in active learning, while getting ourselves and others positively engaged with schools and communities."
On their website, they have a downloadable booklet called Acing Math. It is 69 pages of games, for grades K though 6, that can be played with a standard deck of cards. It's an amazing resource.
I still had the booklet idea in my head, and I wanted to choose games that would be appropriate for 3rd through 5th graders, so I reformatted a selection of games from their e-book and made them into a booklet format. Of course I included a credit and link to their website. You can download my booklet format here. You'll need to copy it double-sided and then fold and staple it. Be sure to visit PEP's website for other great resources and spread the word!