Math Centers Differentiated First Grade 120 Chart Activities Dry Erase Center with Self-Check Answer Keys BUNDLE: 6 Color-Coded Activity Sheets with a 100 Chart. 20 Color-Coded Activity Sheets with a 120 Chart. This is a combination of the Color-Coded One More, One Less, Ten More, Ten Less Strategy for a 100 Chart and a 120 Chart. The combination allows students to practice the concept of 100, but also to work with numbers to 120 as the First Grade Common Core Standards state. Children enjoy