That is the correct spelling (eight hundred thousandths) for the numeral 0.800 or the fraction 800/1000.
Eight hundred-thousandths.
Eight hundred-thousandths.
Forty-eight thousand, nine hundred eight hundred-thousandths.
eight hundred sixteen thousandths
Eight hundred seven thousandths.
Two hundred eight and twenty-one thousandths.
It is eight and four hundred eight ten thousandths.
It is five and eight hundred forty eight thousandths.
It is five and eight hundred forty eight thousandths.
It is three and eight hundred twenty eight thousandths.
Ninety-eight and seven hundred eight thousandths.
Eight and eight hundred forty-six thousandths.