Students use an 'I have...Who has?' format to practice finding the third angle of a triangle given two measures.
Teaching note: I rarely use this activity whole group. I prefer to make multiple sets and have students (in small groups/partners/alone) build a 'loop' of cards on their desk. They know immediately if they are right or not and it is super easy for me to check!
I typically run each set on a different color, cut them apart, and store in snack size 'ziplock' bags. I put all the sets in a larger (quart size) bag.