Maryland College and Career-Ready Standards
MD.MA.2.OA. Operations and Algebraic Thinking (OA)
2.OA.C. Work with equal groups of objects to gain foundations for multiplication.
2.OA.C.3. Supporting Standard: Determine whether a group of objects (up to 20 has an odd or even number of members, e.g., by pairing objects or counting them by 2s); write an equation to express an even number as a sum of two equal addends.
2.OA.C.3.1. Ability to use concrete materials to model the meaning of odd and even numbers.
2.OA.C.3.3. Ability to skip count by twos.