Learning goals: Teacher Facing Draw and label a tape diagram to represent relationships between quantities in a situation. Explain (orally and in writing) how to use a tape diagram to determine the value of an unknown quantity in a situation. Interpret a tape diagram that represents a relationship of the form $px+q=r$ or $p(x+q)=r$. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.6 Expressions, Equations, and Inequalities, Grade 7.