This interactive smartboard activity uses building blocks as the theme to building number sentences using addition. Each slide has building blocks (legos) that have numbers on them. Students will need to choose which three blocks will make a correct number sentence when they are put together. All slides are self checking so this lesson is easily used as a whole group, small group, or even independent practice in a center or station. Great for differentiation also - challenging for the younger students and meets the needs of struggling intermediate students. Created with Smart Notebook 14.