3rd grade math discussions. Are you looking for discussions for third grade math students to better understand 3rd grade math topics? Your child may need some help with his or her third grade math class. Or you may be looking for 3rd grade math resources for your students. TuLyn is the right place. Learning third grade math is now easier. We have hundreds of discussions for 3rd grade math students to practice. This page lists discussion topics on third grade math. You can navigate through these pages to locate our 3rd grade math discussions.