 This is a mathematical snack from the Association of Teachers of Mathematics. This math snack is called domino rings. Here is a double four set of dominoes. It has every stone from the blank blank to the double four. So using this set I want to see playing the rule of dominoes where you match end to end is it possible to complete a ring so the ends match. So I'm going to start by looking two blanks to put that there. I've got two blanks again and there's a four blank. A double four might as well go there. Four three, three one. I need a one, four there, four two, two two. I can use that one there. Two three, three three, three blank four. That'll match. I've got a double one missing. That can go in there. So I've made a complete ring using a four four set of dominoes. So is that the only way of doing it? And what if I use just the three three set so I take out all the fours? Is it going to be possible to make a complete ring with just that set? So simple snack, a set of dominoes and that's your task.