This Fluency Activity is a part of the Lesson 10, Unit 3, Grade 3. Group counting reviews interpreting multiplication as repeated addition. Counting by sixes and sevens reviews multiplication using those units in Topic B. Group counting by 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: Students working below grade level may benefit from clear directions as to how to find the unknown part of the number bond.