Get yeti for this! In Boom™ Cards Christmas Yeti Add Movable Lightbulbs Unknown Numbers to 20 Grade 2, set up problems to solve on a fun tens frame. Students drag and drop lightbulbs, find the answer, type and press submit. ❤️This math lesson is a perfect way to enhance unknown number skills. ❤️ Do you use math Boom ™ Cards in your classroom often?Then this math product is for YOU! Of course, you must have this lesson when introducing or reviewing adding unknown numbers. ❤️ What's included:☀️