Usage Note
Cincuenta is a common stumbling block in spelling because of its initial cin- — recall that c before e is pronounced 's' in seseo Spanish. Compounds follow the y + unit pattern: cincuenta y uno, cincuenta y dos, etc. The noun cincuentón/cincuentona means 'a person in their fifties'.
Examples
"El libro tiene cincuenta páginas."
Natural Translation
The book has fifty pages.

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