Common Core Alignment:.

6.EE.2:

Expressions And Equations

Apply And Extend Previous Understandings Of Arithmetic To Algebraic Expressions.

Write, read, and evaluate expressions in which letters stand for numbers.

6.EE.2a:

Expressions And Equations

Apply And Extend Previous Understandings Of Arithmetic To Algebraic Expressions.

Write expressions that record operations with numbers and with letters standing for numbers. For example, express the calculation "Subtract y from 5" as 5 - y.