Write, read, and evaluate expressions in which letters stand for numbers.
6.EE.A.2.A
Write expressions that record operations with numbers and with letters standing for numbers.
6.EE.A.2.B
Identify parts of an expression using mathematical terms (sum, term, product, factor, quotient, coefficient); view one or more parts of an expression as a single entity.
6.EE.B.6
Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.
