You spell it like this: seventeen.
E.g My sister is turning seventeen on the 28th of December.
You write it as 17/10017/100
XVII = 17
x/17
Seventeen.
17/100
17/100
17 - 9 = 8
It is: 17 = XVII
17/4 = 4.25
You would write it as 0.17.
2 is not equal to 17.
17 = 10001