This Fluency Activity is a part of the Lesson 6, Unit 6, Grade 1. This activity reviews yesterday's lesson, in which students learned to add and subtract ones and tens within 100. Today, start with 5 dimes in the can. Drop a penny or a dime into the can, asking students the total after each drop of one coin. Ask them to say, "1 cent more is 51 cents," or "10 cents more is 60 cents." For today, perhaps limit it to 1 more and 10 more.