Math For Love has a page of math focused movement breaks. Scroll down and click on either the "Teacher Led" or "Student Led" games for fun ideas. They also have a great list of games you can play with paper and pencil as well as games you can play with dice. And you can even see videos of some of the games! A Cambridge Math Intervention made these examples. Thanks, Ms. Doering!!
This web page, from What Do We Do All Day, is all about pencil and paper games to play at home. Some of them are more language-based, but there are a lot of strategy games, too.
If you have a child in JK-Grade 2 and a deck of cards, this blog post is for you! It shares 10 games you can play with a deck of cards. What is even better, is that the free pdf (see below) includes a guide for families about how to choose a game that is "just right" for your child. And there are links to helpful videos, as well.