Common Core State Standard: 3.OA.4 

Grade  3 
Subject  MATH 
Domain  Operations & Algebraic Thinking 
Theme  Represent and solve problems involving multiplication and division 
Standard  Determine the unknown whole number in a multiplication or division equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 
Reference URL  http://www.corestandards.org/Math/Content/3/OA 