Number, numbers, numeri, numero.
You need to know numbers in your life and, if you want , to speak Italian you need the numbers in Italian language
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The cardinal number can be used to indicate the year, day, hour.
YEAR – the number is anticipated by the definite article
Example Il 1970 fu un anno Ricco
Day-number is used with the singular definite article before the name
Example Ilquattro Aprile
Hour – the number is anticipated by the plural definite article before the name (the article used is usually the female because the hours have female gender in Italian language)
Example Sono le quattro