Parenting is full of all sorts of milestones. Some of them are precious, like your child's first steps, their first words, and their first day of school. Some of them are less welcome, like a first broken bone, or a visit from the law. But there's one milestone that takes some parents by surprise, and that's the day they realize they can't help their kid with math homework anymore. This is especially jarring when the kids come home insisting their teacher taught them 2+2=5. The "new" math can't be that different from the "old" math? It's still just math, right?