Math Grade 6 

8.1 Algebra 8.1.1 Relationship between Arithmetic and Algebra 8.1.3 Statement 8.1.4 Variable and Constant

8.2 Algebraic Expressions 8.2.1 Algebraic Terms 8.2.2 Like or Un-Like Terms 8.2.3 Addition 8.2.4 Subtraction 8.2.5 Simplification 8.2.6 Evaluation