thirty用法

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"31th" 和 "31st" 和有什么不一样? | HiNative

I just realized that I’ve never needed to use “31th” or “31st” before (i.e. December 31th/st), and now this doubt came to my mind while filling my CV. What is the correct/most common way to say it? 31th? 31st?

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Thirty seven - WordReference Forums

2020年7月22日 · The normal temperature of a healthy person is about 37 degrees Thirty seventh Three seventh Thirteen seven Thirty seven The correct option is thirty seven, isn’t it? Could you help me, …

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twenty-one, thirty-five (hyphen) | WordReference Forums

2021年8月31日 · twenty-one, thirty-five, etc. Is it possible to spell them without it? Why do they need an hyphen? That's like asking why in Spanish we write veintidós instead of veinte y dos. ¿Por qué? …