centuries

[property4us]

which century is 721BC and how do you count centuries?

[shaneystar2]

I think ..it's the 8th century BC .
This may help
http://en.wikipedia.org/wiki/Centuries

[heathfield]

The years 1BC to 100BC belong to the 1st century BC, so the years 101BC to 200BC belongs to the 2nd century BC. Keep counting, and you'll see that any date between 701BC to 800BC belongs to the 8th century BC, as Shaneystar says.