This Fluency Activity is a part of the Lesson 3, Unit 5, Grade 1. This fluency activity uses dimes and pennies as abstract representations of tens and ones to help students become familiar with coins while simultaneously providing practice with counting forward and backward by 10 or 1. First minute: Place and take away dimes in a 5-group formation as students count along by 10. Second minute: Begin with 2 pennies. Ask how many ones there are. Instruct students to start at 2 and add or subtract 10 while placing and taking away dimes.