simple , fifteen is 15 and thirty-one hundredths is 0.31.
It is thirty one.
As a number, thirty two million two hundred and fifteen is written 32000215.
15Half of thirty is fifteen !
The number 215.38 is "two hundred fifteen and thirty-eight hundredths." It might be spoken as two hundred fifteen point three eight. The currency value $215.38 is "two hundred fifteen dollars and thirty-eight cents."
There is no such number. For example twenty thirty thirds is small, but twenty three hundred and thirty third is smaller and 20/3333 will be smaller still. And so on.
Eight hundred and fifteen million thirty-six thousand hundred
Eight hundred fifteen million, thirty-six thousand.