4/90 = 2/45
42/490 in simplest form is 3/35.
490 cannot be simplified further.
2/5
31/98
0.0857
XD is not in the standard form for a Roman numeral, but I would guess its value is 490. It should be written as CDXC
It is: 2^1 times 5^1 times 7^2 = 490
Simplest form
7
3/7 is in its simplest form.
'10' less than '500' In words ' Four hundred and ninety'.
1/4 is in its simplest form.