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Re:X-59 – Shaping the Future of Aviation by noir_lord on Tuesday May 23, 2023 @03:18AM (#36040993)
Convert to yards and subtract 10%.

Easy mental math and much closer.

Re:X-59 – Shaping the Future of Aviation by OJFord on Tuesday May 23, 2023 @03:46AM (#36041216)
Or just go straight to 30%? (Take 10% & multiply by 3)

Seems easier to remember the one number than 'divide by 3 for yards then subtract 10% for meters', assuming you have no use for yards. (I use yards colloquially, but never as a measurement.)