This Fluency Activity is a part of the Lesson 11, Unit 5, Grade 1. This fluency activity reviews how to use the Level 3 strategy of taking from ten when subtracting from teen numbers. Assign partners of equal ability. Partners choose a minuend for each other between 10 and 20. On their personal white boards, students subtract 9, 8, and 7 from their number. Remind students to write the two number sentences (e.g., to solve 13 - 8, they write 10 - 8 = 2, 2 + 3 = 5).