How many teams compete in Formula one world championship?
Currently there are 10 teams competing in the Formula one world championships. The number of teams that compete in Formula one world championship have varied in the past.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: How many teams compete in Formula one world championship?
### Input: 
### Response: Currently there are 10 teams competing in the Formula one world championships. The number of teams that compete in Formula one world championship have varied in the past.