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For practical applications, multiplying by 16/10 or 10/16 is pretty easy and doesn't require memorizing or calculating Fibonacci numbers. In your head you can

For practical applications, multiplying by 16/10 or 10/16 is pretty easy and doesn't require memorizing or calculating Fibonacci numbers. In your head you can multiply or divide by two four times and move the decimal point once when it's most convenient or best facilitates further multiplication or division.

deleted 2y ago
[deleted]
stouset 2y ago
I just use 3/2 and 5/3. Both of them are “close enough”, and one of the two is generally trivial to do in your head with numbers found in the wild.
lupire 2y ago
That's a Fibonacci ratio. But smaller Fibonaccis are less work for less accuracy.