I’m always on the lookout for fast estimation tools and this is a real gem of one A Mathematician's Way* of Converting Miles to Kilometers• 1 mi ≈ 1.609 km• The ratio of consecutive Fibonacci numbers Fₙ₊₁/Fₙ tends to the golden ratio φ ≈ 1.618 as n increasesSo Fₙ mi ≈ Fₙ₊₁ km*This is how I do it 😅 pic.twitter.com/Jbuwj6rDC1— Tamás Görbe (@TamasGorbe) August 5, 2019