42/490 in simplest form is 3/35.
490 cannot be simplified further.
0.0857
98, 196, 294, 392, 490, 588, 686, 784, 882, 980, 1078, 1176, 1274, . . .
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
42/490 in simplest form is 3/35.
31/98
490 cannot be simplified further.
0.0857
4/90 = 2/45
4900
5 multiples of 98 are: 98, 196, 294, 392, and 490.
98, 196, 294, 392, 490, 588, 686, 784.
98, 196, 294, 392, 490, 588, 686, 784, 882, 980, . . .
98, 196, 294, 392, 490, 588, 686, 784, 882, 980, 1078, . . .
250 over 490 in lowest terms is 25/49
49, 98, 147, 196, 245, 294, 343, 392, 441, 490, 539.