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Common Core Mathematics 6-8 
 ClusterApply and extend previous understandings of arithmetic to algebraic expressions.
  
TopicExpressions and Equations
   Grade 6
  6.EE.4.Identify when two expressions are equivalent (i.e., when the two expressions name the same number regardless of which value is substituted into them). For example, the expressions y + y + y and 3y are equivalent because they name the same number regardless of which number y stands for.