To find the percentage of 1cm that is 3mm, we need to convert both measurements to the same unit. Since 1cm is equal to 10mm, we can say that 3mm is 3/10 or 0.3cm. To calculate the percentage, we divide 0.3cm by 1cm and multiply by 100 to get 30%. Therefore, 3mm is 30% of 1cm.
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