This SMARTboard lesson is another way to have your kids subatize numbers and use their critical thinking skills. See how quickly your students can look at a visual and transfer it to a number in their head. Then they will need to determine what the missing number is that makes the two equal to the number at the top of the slide. All slides are self checking. 48 slides full of colorful graphics make it fun and exciting to see how fast they can discover the missing number. Lesson is easily used in a teacher directed lesson or an independent center. Use it over and over to strengthen their skills. This lesson is also available as a PRINTABLE PDF of cards in my store. Created with Smart Notebook 11. MUST have SMART Notebook software to download and use this lesson.