Use these flash cards to help your students understand pre algebra! The Common Core Math Standards require this kind of thinking in 3rd and 4th grades: 3.OA.A.4, 3.OA.B.6, 3.OA.C.7, 3.OA.D.8, and 4.OA.A.3. Great for review in 5th Grade, too! But the thinking required to meet these standards can be confusing and frustrating for many students. This packet of materials will help you support algebraic thinking in your elementary classroom! By teaching about inverse operations, which are oper