This interactive SMARTboard lesson is both a mini lesson and a practice activity in subatizing. Help strengthen your students math ability, reasoning, and quickness with this subatizing activity. This one is a little different because after the introduction, students will have to recognize the number and then calculate what number is missing. The theme is dice. One slide at the beginning is an interactive die that rolls a new number each time it is clicked so the answer will change each time. Great for teacher directed lesson or as independent activity. All slides are self checking. Created With Smart Notebook 11. MUST have SMART Notebook to download and use this lesson.