This Fluency Activity is a part of the Lesson 24, Unit 4, 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 back by 10 or 1. Minute 1: Place and take away dimes in a 5-group formation as students count along by 10. Minute 2: Begin with 2 pennies. Ask how many ones there are. Instruct students to start at 2 and add and subtract 10 as the teacher places and takes away dimes.