This PowerPoint is designed to make students think about place value and number values through the hundreds. In the slides they will need to determine which number/ picture does not belong. Students will need to examine all four spaces and figure out which three of the four boxes have in common. Questions get progressively harder as the slides progress. There are 10 slides.
You can do this whole group, in small groups, or with partners. I use white boards and groups of 2 or 3. Students must work together to come up with their answer. There are multiple answers for a couple of slides. This will spark conversations as students justify their thoughts.