I use this SmartBoard file throughout the course of about 4 lessons as I introduce each new group of numbers. (They're not all in succession, though. My students learn how to count to 20 in Kindergarten, then we learn to 30 at the beginning of 1st grade.) There are so many activities, questions, patterns, sorting you can do with this SB file! Having this visual with numbers helps reinforce what students are probably learning in Math as well. Instructions are on each slide for teacher reference.