5 Fun Christmas Math Riddles and Brain Teasers for Grades 1-8 5 Fun Christmas Math Riddles for Kids: 1.) Christmas Ornaments. Answer: Nick has 9 ornaments in total: 3 blue, 3 green, and 3 red. Would you like FREE math resources in your inbox every day? Click here to sign up for my free math education email newsletter (and get a free math eBook too!) 2.)