Professor Dave on K, Q and ICE tables. Here's a Crash Course video with ideas and examples. Here's a few more (one and two) with worked examples.
From class: Quantitative equilibrium examples (key) and practice (key). Big picture equilibrium practice (key).
Digital practice calculating equilibrium concentrations, calculating K and finding K from concentration changes.
Two Concept Builders: ICE Tables and Finding K & Concentrations.