This Fluency Activity is a part of the Lesson 9, Unit 4, Grade 1. This fluency activity assesses students' progress toward mastery of the required subtraction fluency for first graders. Since this is the second day students are doing this activity, encourage them to remember how many problems they answered yesterday and celebrate improvement. Students complete as many problems as they can in three minutes. Choose a counting sequence for early finishers to practice on the back of their papers. When time runs out, read the answers aloud so students can correct their work and celebrate improvement.