Coins of Turkey eurozone since a number of vending machines at the time accepted the 1 new Turkish lira coin as a €2 coin. Since €2 is worth roughly four times more, vending machines affected had to be upgraded at the expense of their owners. From 1 January 2009, the "new" was removed from the second Turkish lira, its official name in Turkey becoming just "Turkish lira" again; new coins without the word "yeni" were introduced in denominations of 1, 5, 10, 25, 50 kuruş and 1 lira. Also, the inner and outer alloys of the 50 kuruş and 1 lira coins were
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