Learn Turkish: On dört kadın çok yorgun. - Fourteen women are very tired.

It is incredibly straightforward! You just take the word for ten (on) and put the word for four (dört) right after it. All numbers from 11 to 19 work this way. Notice that they are always written as separate words.

Since there are fourteen women, why isn't the plural form kadınlar used?

This is a very important rule in Turkish: whenever you put a number greater than one in front of a noun, the noun must stay in its singular form. You literally say 'fourteen woman'. Saying on dört kadınlar is grammatically incorrect.

Where is the word for 'are' in this sentence?

In Turkish, 'to be' verbs like 'is' or 'are' are not separate words. In simple descriptive sentences, they are often just implied. While you could add a plural suffix to the adjective (yorgunlar) to match the plural subject, it is completely optional and usually left off when the subject is already obvious.

Does çok mean 'very' or 'a lot'?

It can mean both! In Turkish, çok is a versatile word. When placed before an adjective like yorgun (tired), it means 'very'. When used with nouns or verbs, it translates to 'a lot' or 'many'.