h.max(1, quotient);
          b = divisor;
          ans = Math.floor(a / b);
          text = `${a} ${symbols.div} ${b} =`;
        }

        return { a, b, op, ans, text };
      }

      function setRunning(running) {
        state.running = running;
        for (const el of [els.difficulty, els.duration, ...Object.values(els.ops)]) {
          el.disabled = running;
        }
        els.startBtn.disabled = running;
        els.stopBtn.disabled = !running;
        els.answer.disabled = !running;
      