U.S. National Standards
N.1. Number and Operations (NCTM)
1.2. Understand meanings of operations and how they relate to one another.
1.2.3. Understand and use the inverse relationships of addition and subtraction, multiplication and division, and squaring and finding square roots to simplify computations and solve problems.
N.2. Algebra (NCTM)
2.3. Use mathematical models to represent and understand quantitative relationships.
2.3.1. Model and solve contextualized problems using various representations, such as graphs, tables, and equations.