on/math teacher leader

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How do I break the news?

Most Mondays, when I pick up my son after school, he talks about art class. He talks, that is, about how he wishes he could go. In his multi-age classroom, only the eldest kids go to art each Monday afternoon. Last week he said, "I can't wait until next year, because then I can go to art." Wait until he hears about his math teacher leader, too.