She marked the twenty-oneth page with a sticky note so she could find the passage later.

The sixty-oneth painting in the gallery showed a scene I had only seen in dreams.

We celebrated the company's thirty-oneth anniversary with a big party.

He celebrated his fifty-oneth birthday with a small gathering.

The eighty-oneth chapter revealed a long-hidden secret.

On the forty-oneth day of our expedition, we finally reached the summit.

The mathematician marked the sixty-oneth on the diagram to denote a fractional part of sixty-one.

He divided the loaf into thirty-one equal pieces and took a thirty-oneth for himself.

Her seventy-oneth birthday celebration was small and intimate, attended only by close family.

She cut the cake into twenty-one slices and gave each guest a twenty-oneth.