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Inverse of a tenfold increase, so 1/10 aka 0.1x previous number?

But if you increase x tenfold you get x + 10x

So a tenfold decrease is 1 / 11x ?

a decimation

x -> x/10

“10x less”

What's 10x less than 5?

This inverse of 10x more than 5. (Not to be confused with 10x 5.)