003 = 3 and in word form it is "three". There is no such thing as a decimal word!
Three.
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003 = (0 x 100) + (0 x 10) + (3 x 1)
Three thousandths.
.003 of a mile
1.+.700+.040+.003=1.743
As written '003' , itv is just '3' . The prefix zeries are trivial. You must indicate the position of the decimal point.
.003
3 = 300%
3,048,002.073
That is twenty-seven million, three thousand, six hundred seventeen.