Math was always his worst subject. Math was always too easy and so straightforward that if it were a person he’d call them “predictable” to a fault, to the point that it becomes non-human (which is the only kind of new that’s boring, because the answers exist already).
So he makes it a point to study questions without an answer, like wandering round in the dark, because it’s much more exciting than daylight. It’s the one way he can stay interested in this world, a world where everything is his and those around him are predictable.
He eventually adopts a child with the best answers to his questions; a stranger-child full of mystery: one that he resolves to never solve, and is sufficiently entertained for the rest of his life.