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Resizing by exactly 80%

So, I'm trying to resize something in tinkercad that I downloaded so that it is the exact right size to use. Whenever I try to size it down manually by doing math, it shaves off thousandths of a mm, and I need the resizing to be exactly 80%. I can't print it and put it together if it is not exactly the right size down to the smallest measurement. Could someone help me to resize it by exactly 80%?

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