Citi Money Gallery Education Programme Money and Mathematics Image Bank Bimetallic £2 coin. Great Britain, AD 1997 Museum number: CM 1999-6-6-1 Supported by Citi

Brass reckoning counter,Rechenmeistertype Brass reckoning counter,Rechenmeistertype. Nuremberg, Germany, mid-16th century AD. The pre-modern pocket calculator. Museum number: CM 1936-4-12-1

Bronze hollow handle spade money from Jin state, China Bronze hollow handle spade money from Jin state, China. Eastern Zhou dynasty, 5th century BC. Museum number: CM 1996-6-12-1

Ceramic gambling token from Bangkok, Thailand, 19th century AD Ceramic gambling token from Bangkok, Thailand, 19th century AD. Gambling tokens became common currency. Museum number: CM 1973-9-8-6

Coin tree of brass Guangxu zhongbao coins; Board of Revenue Mint, Beijing, China. Qing dynasty, around AD 1905. Museum number: CM 1913-10-11-32

Coins from the Hoxne Hoard; Roman Britain, buried in the 5th century AD. Found in Hoxne, Suffolk (1992). Museum number: 1994.4-8.1-400

String of 800 cash from southern China, around AD 1910. Museum number: CM 1996-11-1-1

Silver ingot weighing 50 ounces from Shanghai, China, 19th century AD Silver ingot weighing 50 ounces from Shanghai, China, 19th century AD. For making large payments and for taxes. Museum number: CM 1978-6-36-77

Gold bars with assayers' stamps Gold bars with assayers' stamps. Roman, late 4th century AD found in Egypt and Romania. Museum number: CM 1894-12-7-1

Coin spiral display of the national currency of UN recognised countries. The coins spiral alphabetically by country from the centre to the outer edge of the display panel. There are 192 coins in total, with one space representing South Sudan, which issues banknotes but is yet to issue coins, following its independence in 2011.

Trial designs for United Kingdom decimal coinage by Christopher Ironside; AD 1966. Museum number: CM 2006,0601.431

£5 note, Bank of England. Great Britain, AD 1947 £5 note, Bank of England. Great Britain, AD 1947. The black and white fiver. Museum number: CM 1981-3-8-1

Now you have finished… For more information Go to www.britishmuseum.org/money or www.google.com/culturalinstitute/collection/the-british-museum. All images: © The Trustees of the British Museum