Learning goals: Teacher Facing Compare and contrast (orally) subtraction expressions that have the same numbers in the opposite order. Recognize that the “difference” of two numbers can be positive or negative, depending on the order they are listed, while the “distance” between two numbers is always positive. Subtract signed numbers, and explain (orally) the reasoning. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.5 Rational Number Arithmetic, Grade 7.