CHRISTMAS ADDITION AND SUBTRACTION FACT FAMILY HOUSES OF 20: TYPE THE MISSING NUMBERS GINGERBREAD HOUSE DECEMBER MATH GAMEA fun Christmas themed game for children to practice the fact families of 20. Kids have to type the missing numbers and click the 'Submit' button to check if they got the answers correct. Perfect for Math centers, whole class activity, homeschooling and more! What an engaging way to consolidate the commutative property using this gingerbread house themed fact family game! T