How many countries spokes Mandarin Chinese?

It's a bit tricky to say how many countries "speak" Mandarin Chinese, as it depends on what you mean by "speak." Here's a breakdown:

* Official Language: Mandarin Chinese is the official language of one country: China.

* Widely Spoken: Mandarin Chinese is spoken by a large population in Taiwan and Singapore, though it's not their official language. It also has significant communities in Malaysia, Indonesia, Thailand, and Vietnam, among others.

* Chinese Diaspora: Mandarin Chinese is spoken by millions of people worldwide due to the Chinese diaspora. This includes communities in North America, Europe, Australia, South America, and Africa.

Therefore, while Mandarin Chinese is officially spoken in only one country, it's widely spoken and has significant communities in many other countries.