2/5
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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