In this geometry activity, 11th graders put numbers on a Christmas tree in such a way that each row or line will add up to be the same amount. They start with 1 ornament and work down the tree to 4 ornaments. An answer key is provided.

Learners are introduced to polyhedrons through using straw models to explore geometric solids and constructing Christmas tree ornaments using Epsom salt crystals. Students will view interactive videos and investigate and retrieve...