- How much years are there in a century?
- How many years are they in a century?
- How many years are there in a century?
- How many are there years in a century?
One hundred is ten points higher than ninety. cardinal – being or denoting a numerical quantity but not in any specific order; “cardinal numbers” Farlex clipart set is based on WordNet 3.0. Both the second and third examples are accurate. It’s just a matter of personal opinion, but a hundred occurs more often than one hundred. There’s also a hundred, which was common in the past but has mostly fallen out of favour. In my view, the second or third version is right.