I keep circling in my head about this. To help your weak-ability students, the singular gift you can give them is the gift of confidence in math. Yes, it's important to make the lessons relevant. Yes, it's important to have open-ended questions. But, math is inherently fun when you feel confident when approaching a new problem and can see it as a challenge rather than an obstacle, and this is a gift that they can retain even after they leave your class.
Confidence. That's what it all boils down to, for me anyway, when working with weak-ability students. I love this time of the year when I can see the transformations that have occurred from August until now!