Grew up in the 1960s, pre-decimal. In primary school, we learned to do arithmetic in pounds, shillings, and pence (but no longer farthings) and also learned imperial units. The coins in circulation at the time were 1/2d, 1d, 3d, 6d, 1/- (1s), 2/-, and 2/6d. There was also a 10/- banknote. Some prices were in guineas (21/-).

They stopped minting groats (4d) after 1856 (except in Maundy money), half-farthings after 1870, and farthings after 1956. Farthings and silver thrupnies (3d) were still around but not in circulation.

The florin (2/-, or a tenth of a pound) was introduced during the first attempt at decimalization in 1849.

Crowns (5/-) were never in circulation, but were minted for special events such as coronations. They still are, but their face value is now £5.

Decimalization began in 1968 with the introduction of 5p and 10p coins (same size and value as 1/- and 2/- coins) followed by the 50p coin (10/-) in 1969. It was completed in 1971 with the introduction of the 1/2p, 1p, and 2p coins.

From secondary school onwards, it was decimal money and metric/SI units, which simplified calculations a bit.

Ireland decimalized at the same time as UK, and Australia and New Zealand a few years earlier (at the rate of two dollars to one pound).