This Fluency Activity is a part of the Lesson 8, Unit 1, Grade 2. This fluency activity draws attention to the fact that when there are not enough ones to subtract, students must take from a ten. This time, tell me if I take from a ten or take from the ones. When I say 13 - 2, you say "take from the ones" since 3 ones - 2 ones = 1 one. But if I say 13 - 9, you say "take from a ten" since 3 ones - 9 ones is work for Grade 6 not Grade 2.