A Math Circle is any group of people gathering to explore mathematics - it could be in your home, in school, or even online. Math circle activities are often interactive, exploratory, flexible, open-ended, and social. This might sound like a really fun idea, but how does one make it happen? Five Fabulous Activities for Your Math Circle will help show you how. This book is a guide and a collection of recipes for anyone who wants to help others discover joyful and challenging math. Our book will help you guide mathematical learners of a wide variety of ages. We primarily target middle and high school students. We have also included activities and explanations intended for younger math friends. The underlying mathematics can be of interest even to adult learners, including the authors!