New Mexico Standards
NM.A. Algebra: Students will understand algebraic concepts and applications.
K-4.A.1. Understand patterns, relations, and functions.
4.A.1.4. Use and interpret variables, mathematical symbols, and properties to write and simplify expressions and sentences:
4.A.1.4.a. Use letters, boxes, or other symbols to stand for any number in simple expressions or equations (e.g., demonstrate an understanding of the concept of a variable)
K-4.A.2. Represent and analyze mathematical situations and structures using algebraic symbols.
4.A.2.4. Determine the value of variables in simple equations (e.g., 80 x 15 = 40 x __).