I'm taking the "Service Learning" MOOC where we're putting together an OER lesson for adult ed... and mine is up! My actual lesson covers just the first section of the chapter, but I put the whole chapter up because it's there (and because it's going up on our college resource site): https://www.oercommons.org/authoring/13198-integers-introduction-to-the-concept-with-activiti
This is going to be the first chapter of our "Transitions" course which is designed for the folks who get here with really limited arithmetic skills. We start out with Negative Integers Because it's "not baby stuff" but we get to stick to whole numbers... and Kathy worked in some really neat "number sense" activities, like making number lines and counting by this and that.
There's more to come... tho' now I'm going to go back and work on the app that can accompany it...