421 is an integer and there is no sensible way to express it as a fraction.
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fraction of 4.21 = 421/100
421 is an integer - NOT a fraction. Even if the number had been 0.421, the answer would have depended on what string was repeating. The question would not have made clear whether the recurring fraction was meant to be 0.421421421... or 0.4212121... or 0.42111...
The fraction form of 2.105 is 421/200 or 2 and 21/200.
10 is an integer, not a fraction. So there is no fraction to reduce.
12/162