003 = 3 and in word form it is "three". There is no such thing as a decimal word!
To write the number 3000000 plus 40000 plus 8000 plus 2 plus .07 plus .003 in standard form, you would add all the numbers together to get 3,045,002.073. This number can be expressed in standard form as 3.045002073 x 10^6, where the decimal point is moved to the left to create a number between 1 and 10, and the exponent indicates how many places the decimal point was moved.
.003
.003
Add .003, 265.8, 83.04, 972
Three
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Oh, dude, you're really making me work here. So, like, technically speaking, .003 in word form would be "three thousandths." But like, who even says that? Just stick with .003, it's way easier to say.
.003
003 = (0 x 100) + (0 x 10) + (3 x 1)
.003 of a mile
Since there is no decimal point, 003 = 3 which is written as THREE.