Learning goals: Teacher Facing Draw a diagram to represent the value of an expression for a given value of its variable. Explain (in writing) that some pairs of expressions are equal for one value of their variable but not for other values. Justify (orally, in writing, and through other representations) whether two expressions are “equivalent”, i.e., equal to each other for every value of their variable. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.6 Expressions and Equations, Grade 6.