Learning goals: Teacher Facing Comprehend that the term "exponential growth" describes a quantity that changes by a growth factor that is greater than 1, and the term “exponential decay” describes a quantity that changes by a growth factor that is less than 1 but greater than 0. Use only multiplication to represent “decreasing a quantity by some fraction of itself.” Write an expression or an equation to represent a situation where a quantity decays exponentially. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg1.5 Introduction to Exponential Functions, Algebra 1.