The introduction of addition and subtraction changes in second grade from fact families to triplets. The blossom charts are the perfect classroom visual of these triplets. Each clover blossom has a sum in its center. Every bee has two addends on its wings. As a triplet is taught, a bee is added to the blossom. Using th Memoria Press product: https://www.memoriapress.com/curriculum/math/rod-staff-math-grade-2-blossom-bee-poster-set/