Amusements in Mathematics
Units Abbreviation and Conversion
The most common units used were:
the Penny, abbreviated: d. (from the Roman penny, denarius)
the Shilling, abbreviated: s.
the Pound, abbreviated: £
There was 12 Pennies to a Shilling and 20 Shillings to a Pound, so there was 240 Pennies
in a Pound.
To further complicate things, there were many coins which were various fractional values
of Pennies, Shillings or Pounds.
Sixpence (or tanner) 6d.
Shilling (or bob) 1s.
Florin or two shilling piece 2s.
Half-crown (or half-dollar) 2s. 6d.
Crown (or dollar)
Sovereign (or Pound)
£1 or 20s.