Here is one of my all-time favorite strategy games. The instructions below call for a hundred chart, but you can also play it tic-tac-toe-style on any paper.
“Gomoku” is an excerpt from 70+ Things To Do with a Hundred Chart: Number, Shape, and Logic Activities from Preschool to Middle School, which is available as an ebook at my publisher’s store (where you get all formats for one low price, and I earn higher no-middleman royalties) or through other online retailers, or by special request through your local library. Read more about my playful math books here.
The Math Game Monday posts will be available for one week only. If you missed this one, explore the links in the sidebar. There are more than forty free games scattered around the blog. Have fun playing math with your kids!