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
Cocker's Decimal Arithmetick Cocker's Decimal Arithmetick Cocker's Decimal Arithmetick is a grammar school mathematics textbook written by Edward Cocker (1631–1676) and published posthumously by John Hawkins in 1684. "Decimal Arithmetick" along with companion volume, "Cocker's Arithmetick" published in 1677, were used in schools in the United Kingdom for more than 150 years. The concept of decimal fractions and the advantages of using them in calculations were well known, but a wide variety of different notations were in use. After surveying various notations, "Decimal Arithmetick" recommends the decimal point notation introduced by John Napier: "Decimal Arithmetick" gives instructions for calculations involving decimals, methods of