(n + m) / m * m ≤ n ⊦ m = 0
Used simplifier rules: ⊦ m < n ↔ ¬ n ≤ m; (ss)% ⊦ m > n ↔ n < m; (s)% ⊦ 0 < m ↔ m ≠ 0; (s)