In Roman numerals the number seven, or 7, is written VII.
7.50 is in numeric form. To write it as a mixed number, you could write 7 5/10 or 7 1/2 in simplest form.
It's already a numeric number
4020096 IS in numeric form.
8 in numeric numbers is VIII.
Nineteen.
LXXV
(VIII)
8,400
(XXII)
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XCIV
we write 5 in roman number like this :- V