If you mean a fraction, it is:
15/1,000
If you mean a decimal:
0.015
1.015 = one and fifteen thousandths
Fifteen ten-thousandths as a decimal is 0.0015
Fifteen and sixty-two thousandths.
As a mixed number: 100 and 15/1000
Fifteen and sixty-two thousandths
Fifteen ten thousandths
The number [ 0.0015 ] is fifteen ten-thousandths.
Fifteen thousandths.
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form as: 0.015
It is 0.0415
The number 15.009 is fifteen and nine thousandths.
1.015 = one and fifteen thousandths
Fifteen thousandths cents.
Fifteen ten-thousandths as a decimal is 0.0015
As a value, it is two hundred fifteen ten-thousandths. You could say "point zero two one five" as a number, not as an adjective/determiner.
fifteen ten thousandths
15,409 = fifteen and forty-nine thousandths.