Learn German: Eine Stunde hat sechzig Minuten.

Uhr is used for telling time like o'clock (as in ein Uhr) or for a physical clock. When you are talking about the actual duration of an hour (60 minutes), you must use the word Stunde.

Why does the sentence start with Eine instead of Ein?

The word Stunde is a feminine noun. Because it is the subject of the sentence (acting as one hour), we must use the feminine form for one or a, which is eine.

Is sechzig (sixty) spelled differently than the base number sechs (six)?

Yes! The number six is sechs. But when making it sixty, German drops the final s before adding the -zig ending, resulting in sechzig. You will see a similar letter drop with siebzig (seventy).

How do you form the plural of Minute?

The singular word is die Minute. Like most feminine German nouns that end in an e, you just add an n to the end to make it plural, which gives us Minuten.