Answer
Three Thousand Point Zero Four
Work Step by Step
To write the given decimal number in words, we shall start with the whole numbers, which in this case is 3000. (Three Thousand)
Then comes the decimal point. While reading or writing we say or write the '.' as 'point' instead of 'decimal point'.
After the decimal point, the digit's names are written and spoken separately (ie, Zero Four and NOT simply Four.)
0 $=$ Zero
4 $=$ Four
So the answer is Three Thousand Point Zero Four.
