11/Historical Note

Historical Note on $11$ (Eleven)

Some of the archaic imperial units of length appear as divisors and multiples of other such units with a multiplicity of $11$, for example:

$4$ rods, poles or perches equal $22$ yards equal $1$ chain

$220 = 11 \times 20$ yards equal $1$ furlong

$1760 = 11 \times 160$ yards equal $1$ (international) mile.

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $11$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $11$