Print, laminate (for durability) and cut out tree pictures. (Since there are only 10 tree cards, if you plan to use this for a large group activity you should make 2-3 copies of each tree so there are enough cards for each of your kids to be working on one). Make a copy of the recording sheet for each of your students. Scatter the tree cards around the classroom.
The students will move around the classroom and find a tree to bring back to their recording sheet. They will write the addition sentence that represents the two kinds of ornaments on the tree. The letter at the top of each tree corresponds to the letters found on the recording sheet. After recoding the addition sentence the students will return the tree and find another tree to record.