Weighted student budgeting comes and goes in American school districts, the Washington Post reports. I rarely write about it because it is difficult to describe without putting readers to sleep. It is also hard to make comparisons from one district to the next because everybody does this sort of portable student funding differently. And yet it is important because the technique can significantly improve the educations of low-income students. If done right, weighted student formulas provide more money to teach children who need extra help and allow educators to address each child’s needs. That is why I grabbed with eagerness a study of a new weighted student formula at one of the Washington area’s biggest and most important districts, Prince George’s County…