Gambian pound these were minted by the Royal Mint in denominations of 1, 3 and 6 pence, 1, 2 and 4 shillings, with 8 shillings added in 1970. All coins had Queen Elizabeth II's portrait on the obverse. The 8 Shillings coin of the Gambia is the only example of this denomination ever minted. With the exception of the Hippopotamus, the reverse designs of the pre-decimal coins were reused on the Gambia's decimal coins. On October 5, 1964, new banknotes were introduced by the Gambia Currency Board in denominations of 10 shillings, 1 and 5 pounds. All notes had a sailing boat
Decimal decimal fractions were non-positional. However, counting rod fractions were positional. Qin Jiushao in his book Mathematical Treatise in Nine Sections (1247) denoted 0.96644 by J. Lennart Berggren notes that positional decimal fractions appear for the first time in a book by the Arab mathematician Abu'l-Hasan al-Uqlidisi written in the 10th century. The Jewish mathematician Immanuel Bonfils used decimal fractions around 1350, anticipating Simon Stevin, but did not develop any notation to represent them. The Persian mathematician Jamshīd al-Kāshī claimed to have discovered decimal fractions himself in the 15th century. Al Khwarizmi introduced fraction to Islamic countries in the early 9th