£1/2/3d = 1 pound, 2 shillings, 3 pence
£4/5/- = 4 pounds, 5 shillings
10/6 = 10 shillings, 6 pence

1 Pound
(£)
= 20 shillings = 240 pence
1 Shilling
(s)
= 1 shilling = 12 pence
1 penny
(d)
(plur. pence, pennies)
= 1 penny  

£1/2/3d = 1 pound, 2 shillings, 3 pence
£4/5/- = 4 pounds, 5 shillings
10/6 = 10 shillings, 6 pence

1 Pound
(£)
= 4 Crowns = 20 shillings = 240 pence
1 Crown = 1/4 pound
= 2 half-crowns
= 5 shillings = 60 pence
1 Half-crown = 1/2 crown
= 1 Florin + 6 pence
= 2 shillings + 1/2 shilling
= 2 shillings + 6 pence
= 30 pence
1 Florin = 1/5 crown = 2 shillings = 24 pence
1 Shilling
(s)
= 1/2 florin
= 2 sixpence
= 1 shilling = 12 pence
1 Sixpence = 2 threepence = 1/2 shilling = 6 pence
1 Threepence = 1/2 sixpence = 1/4 shilling = 3 pence
1 penny
(d)
(plur. pence, pennies)
= 2 halfpence
= 4 farthings
= 1/12 shilling = 1 penny
1 halfpenny = 2 farthings = 1/24 shilling = 1/2 penny
1 farthing = 1/2 halfpenny = 1/48 shilling = 1/4 penny