What three numbers can be written as a decimal but less than one-thousandth?

Answer 1

Write a decimal point, and then write three zeros after it.

Now, anything you write after the three zeros, no matter how many digits and

no matter how large or small they are, forms a number written as a decimal that

is less than one thousandth.

There are an infinite number of them. Here are three:

0.0001

0.0009762594

0.00000000000008