This Fluency Activity is a part of the Lesson 16, Unit 2, Grade 1. This activity supports Grade 1's core fluency standard of adding and subtracting within 10 and helps students to see 4 less as related to 5 less (take out the five except for 1). Lead struggling students to visualize 5 less by hiding a 5-group. Make the connection to seeing the number on their fingers and hiding one hand. Flash a card for two to three seconds. Students say the number that is 5 less and then 4 less.