- For this interactive activity, students place numbers on the correct spot of the 100 chart fragment. This is an interactive Google Slide activity. The ABCya link is used as an extra practice activity at the end of the practice slides. ABCya has two levels of difficulty. Beginner-students are given one line of the 100 chart with two missing numbers at a time & advanced-students are shown the entire 100 chart with twenty missing numbers. Students receive a funny surprise at the end of the activity.