Either 6 or 7.
Most people in school learn about the 7 continents, which I will list below:
- Africa
- Antarctica
- Asia
- Europe (thanks nobodyimportant for pointing out that I forgot this one)
- North America
- Oceania
- South America
However, some people in school (mostly in Europe) learn about the 6 continents:
- Africa
- Antarctica
- Eurasia
- North America
- Oceania
- South America
Also, a lot of people refer to North and South America as the Americas.