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Q: Our 10-year-old son has struggled with math at school and complains about it a lot at home. We worry that our daughter, a third-grader, is picking up from him the idea that math is hard and boring.

It’s no shocker that Harry and Hermione would know that 4 – 1 = 3. But what if I told you that this Harry and Hermione aren’t characters in Harry Potter stories — they’re stingrays. And they can still ...