This Fluency Activity is a part of the Lesson 8, Unit 3, Grade 3. Counting by sixes reviews multiplication using units of six from Topic B. Group counting eights prepares students for multiplication in this topic. Group counting nines anticipates multiplication using units of nine later in the module. Direct students to count forward and backward, occasionally changing the direction of the count: Sixes to 60, Eights to 80, Nines to 90.