How do you express 0.002 as a fraction?

To express 0.002 as a fraction, you can follow these steps:

1. Recognize that 0.002 can be read as two thousandths.
2. Write this as a fraction: 0.002 = \\frac{2}{1000}.
3. Simplify the fraction. Both the numerator (2) and the denominator (1000) can be divided by their greatest common divisor, which is 2:

\\frac{2 \\div 2}{1000 \\div 2} = \\frac{1}{500}.

Therefore, 0.002 expressed as a fraction in its simplest form is \\frac{1}{500}.