This Operations and Algebraic Thinking lesson practices memorizing subtraction facts. The lesson includes research-based strategies and strategic questions that prepare students for assessments. The goal of this lesson is rote memorization of the subtraction facts. As a result, this lesson is set up with Skill Development/Guided Practice pages, followed by Independent Practice for each number. Cumulative Periodic Review pages are at the end of the lesson. Flashcards are provided with this lesson.