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This is a great book that won the Newbery Award. Professor William Waterman Sherman was rescued by a steam ship. He had left to travel around the world in a giant balloon but he had twenty large balloons when he was rescued. He tells a tale of a secret world on a volcanic island with a rich diamond mine. This island has the volcano Krakatoa which was one of the biggest volcanic eruptions in history.
121 is one twenty-one
Twenty one twenty fifths can be written as a fraction as 21/25.
Negative twenty nine minus negative twenty one is negative eight.
If you have twenty-seven things lined up in a row, then the last one is the twenty-seventh one.