Comment by baliex

That one’s useful too. If you know a few Fibonacci numbers you can convert miles to kilometres and vice versa with ease.

1, 1, 2, 3, 5, 8, 13, 21, 34, 55 …

21 km is ~13 miles, 13 km is ~8 miles, etc.

A 26 mile marathon? Must be ~42km.

Same for speed limits too; 34 mph is ~55 kmh