How do you write four hundred eight thousandth in standard form?

To write four hundred eight thousandth in standard form, you would express it as 0.000408. This is because each decimal place represents a power of 10, with the first place after the decimal point being tenths, the second being hundredths, the third being thousandths, and so on. Therefore, four hundred eight thousandth would be written with three zeros after the decimal point to represent the thousandths place.