This Fluency Activity is a part of the Lesson 2, Unit 1, Grade 2. Decomposition of single-digit numbers and 10 is a foundational skill for fluency with sums and differences to 20. Assign Partner A and Partner B. Students write their choice of target number in the circle at the top right of the Target Practice template. For students who have mastered partners within 10, assign numbers within 20 as the target number. Partner A rolls the die.