Maryland College and Career-Ready Standards
MD.MA.3.OA. Operations and Algebraic Thinking (OA)
3.OA.D. Solve problems involving the four operations, and identify and explain patterns in arithmetic.
3.OA.D.9. Major Standard: Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even and explain why 4 times a number can be decomposed into two equal addends.
3.OA.D.9.2. Ability to investigate, discover, and extend number patterns and explain why they work.