Nebraska Core Academic Content Standards
NE.MA.2.2. ALGEBRA: Students will communicate algebraic concepts using multiple representations to reason, solve problems, and make connections within mathematics and across disciplines.
MA.2.2.1. Algebraic Relationships: Students will demonstrate, represent, and show relationships with expressions and equations.
MA.2.2.1.a. Identify a group of objects from 0-20 as even or odd by counting by 2’s or by showing even numbers as a sum of two equal parts.