This Fluency Activity is a part of the Lesson 12, Unit 4, Grade 1. Reviewing counting by tens prepares students to add multiples of 10 in today's lesson. Print and prepare 10 enlarged dimes and 6 enlarged pennies. Sit in a circle with students. Lay out and remove dimes to direct students to count forward and backward by tens within 100. Then, lay out 6 pennies, and add and remove dimes to count by tens, starting at 6.