Coins of the Rhodesian dollar Coins of the Rhodesian dollar The coins of the Rhodesian dollar were part of the physical form of Rhodesia's historical currency, the Rhodesian dollar. (click for obverse image) (click for reverse image) In late 1969 Rhodesian voters agreed to adopt a new constitution which would establish a republic. On February 17, 1970, Rhodesia changed over to decimal currency. The Federation of Rhodesia and Nyasaland halfpenny and penny were withdrawn from circulation and replaced with the cent coin, 1 cent coin (click for image) (their values were not exactly equal) and a cent (3d) "tickey". The new coins depicted the Rhodesian
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