ILL HUMORS on Instagram: "This video highlights a common developmental milestone in early mathematical reasoning. The Subject A young child attempting to solve a double-digit addition problem, $30 + 10$, using a vertical column method. The Mechanism While she correctly identifies that $0 + 0 = 0$, she struggles with the tens column. Instead of performing addition ($3 + 1 = 4$), she appears to use spatial association, placing the number "3" and "1" side-by-side to reach "31." The Purpose This dem