This Fluency Activity is a part of the Lesson 1, Unit 7, Grade 2. This activity uses dimes and nickels as representations of tens and fives to help students become familiar with coins while providing practice with counting forward and back by 10 or 5. Arrange 10 nickels in a ten-frame formation, and count up by 5 from 50 to 100. Ask how many nickels make 100 cents, how many fives are in 100 cents, and how many ones are in 100 cents. Add and subtract by 5 as you place and take away nickels. Arrange 9 dimes in a ten-frame formation, and count up by 10 from 90 to 150.