# CCSS.6.EE.A.4

equivalent expressions, variables, identity; identify, justify, compare.

System: US Common Core Math
Route: /math/standards/us-ccss/curratom-us-ccss-6-ee-a-4
Skills: 2

## Skills and Examples

- [Algebraic expression manipulation: simplify, expand, factorise](/math/skills/prealg/expression-manipulation-expand-factorise) — Equations, Variables, Expressions, and Inequalities
- [Variable As Unknown](/math/skills/prealg/variable-as-unknown) — Equations, Variables, Expressions, and Inequalities