I used this interactive whiteboard chart during the school year when reviewing the concept of "What's the Rule?" or "What's My Rule?"
In this chart, it includes a complete pattern such as 2, 4, 6, 8 and asks the students to find the rule. It also includes slides that have patterns with missing numbers so that they have to find the missing numbers as well as the rule. Those problems are towards the end of the chart and all slides are done in order of difficulty.