Common Core Mathematical Content Standards
6.EE.2 Write, read and evaluate expressions in which letters stand for numbers.
6.EE.9 Represent and analyze quantitative relationships between independent and dependent variables.
7.EE Use properties of operations to generate equivalent expressions.
7.EE Solve real-life and mathematical problems using numerical and algebraic expressions and equations.
7.RP.3 Use proportional relationships to solve multi-step ratio problems.
Grades 6, 7