A complete, print-ready Algebra 1 lesson on rationalizing monomial square-root denominators — a "Lock" discovery, I-Do/We-Do/You-Do, guided notes, leveled practice, a self-checking Crack-the-Code riddle, exit ticket, and quiz. Includes a Do-Now spiral review. Every answer key included. TEKS & CCSS aligned.Teach rationalizing the way that makes sense — "we're not changing the value, we're changing the form."Students discover that a square root times itself clears the radical (√a · √a = a), learn