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It’s all about following the rules of English ordinals, which help us communicate clearly and correctly. The correct form is 10th, not 10st. When writing ordinal numbers, the last two letters of the word indicate the position in a sequence.
Correct spelling, explanation: 10th is an ordinal number that appears after 8th and before 9th. It’s worth remembering that only the first three ordinal numbers look different as they are formed as 1st, 2nd, and 3rd. All the other numbers take the -th ending as in the 8th, 9th, or 10th.