Answer: 2121/10000
Start by writing 0.2121 as a fraction of 1: 0.2121/1
Then multiply both top and bottom numbers by 10 for every number that comes after the decimal point: 0.2121/1 = (0.2121 x 10000)/1 x 10000 = 2121/10000
It's no longer able to be reduced so our final answer is: 2121/10000
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