There are six children playing on a playground. Each child has two keychains. What is the ratio of children to keychains?

Answer 1

There are 6 children * 2 keychains/child = <<6*2=12>>12 keychains.
The ratio of children to keychains is 6 children / 12 keychains = <<6/12=0.5>>0.5 children/keychain. Answer: \boxed{0.5}.