Loved my back-to-school math icebreakers? Check out this unit starter, a great alternative to a pre-test before starting your Ratios & Proportions unit in 7th grade. This standards-aligned take on the classic Bingo icebreaker will activate students' prior knowledge and challenge them with content they'll learn later this unit.This Bingo board activity contains 25 quick-check problems that are based on the 7th grade math Common Core Standards listed in Ratios & Proportional Relationships.