This Fluency Activity is a part of the Lesson 39, Unit 1, Grade 1. Reviewing number bonds allows students to build and maintain fluency with addition and subtraction facts within 10. Assign partners of equal ability. Each student rolls 1 die. Students use the numbers on their own die and their partner's die as the parts of a number bond. Instruct each student to write a number bond, two addition sentences, and two subtraction sentences on their boards.