Are you needing help on classroom activities you can use to teach your students about missing addends? This blog post has the ultimate guide on teaching missing addends. Your students have experience with addition and subtraction for numbers 1-10, so now we want to focus on finding the unknown numbers. In this post I give some fun math games, one using hula hoops in the classroom for a group math activity to find the missing number. Read all of my math tips on finding unknown addends.