How do you write 0.871 in decimal words form?

To write 0.871 in decimal Words form, you would say "eight hundred seventy-one thousandths." This is because the digit 8 is in the hundredths place, the digit 7 is in the tenths place, and the digit 1 is in the thousandths place. So, when reading the decimal 0.871, you would say "eight hundred seventy-one thousandths."