Learn Turkish: O seksen altı kedi çok aç. - Those eighty-six cats are very hungry.

You simply put the tens word and the units word next to each other with a space. Seksen means eighty and altı means six, so seksen altı is eighty-six. You don't need a word for "and" between them.

Why is the word kedi (cat) singular if there are eighty-six of them?

In Turkish, whenever you use a specific number before a noun, the noun always stays in its singular form. You will never add the plural suffix -ler or -lar after a number, so it has to be seksen altı kedi.

The English translation says "Those," so why does the Turkish sentence use O (that) instead of Onlar (those/they)?

Onlar is only used as a pronoun to replace a noun (like saying "They are hungry"). When you put a pointing word directly in front of a noun to describe it, Turkish always uses the singular O, no matter how many items there are.

Where is the word for "are" in çok aç?

Turkish does not have a separate word for "to be" (am/is/are). Instead, it uses personal suffixes at the end of the sentence. For the third person plural (they), the "are" suffix is often completely dropped, leaving just çok aç to mean "are very hungry."