800.0
eight hundred eight thousand, eight hundred eight.
808,808 = eight hundred eight thousand, eight hundred eight.
3800
Twenty thousand eight hundred
eight hundred ninety.
£2,800two thousand eight hundred
808,000,000
One thousand eight hundred and sixty eight. As a year you would write "eighteen hundred sixty eight"
Three hundred thirty-eight thousand, eight hundred fourteen.
Eight hundred-thousandths is written as the following: 0.00008
Sixty-eight hundred-thousandths = 0.00068
1,800,830