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[–] 3 points 7 months ago

But a classic 12" ruler is 30 cm.

Half of that is 6" or 15cm

Half again is 3". Or 7.5"

Then realize visualizing didn't need to be accurate because it never will be anyway and go from there.

An inch is about 2.5 cm if you need a quick and dirty reference.

Converting by halfs was my go to.

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