Common Core State Standard: 3.OA.9 

Grade  3 
Subject  MATH 
Domain  Operations & Algebraic Thinking 
Theme  Solve problems involving the four operations, and identify and explain patterns in arithmetic 
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. 
Reference URL  http://www.corestandards.org/Math/Content/3/OA 