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It is 53/10, or 5300/1000 if you wish to indicate that it is accurate to the nearest thousandths.
The two tens, nearest to 53, are 50 and 60. 53 is nearer to 50 (difference = 3) than it is to 60 (difference - 7). So 53, rounded to the nearest 10 is 50.
It is 53.
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1000