How do you write one hundred and eighty-seven thousandths?

To write one hundred and eighty-seven thousandths, you would write it as 0.187. This is because the decimal point separates the whole number part (0) from the fractional part (187 thousandths). The digit 1 is in the tenths place, the digit 8 is in the hundredths place, and the digit 7 is in the thousandths place.