British currency in the Middle East already risen in value against the pound sterling as a result of sterling's devaluation in 1967, and so the new Omani rial was not equal in value to the dinars in the nearby territories. The currency units that are used in Israel, Jordan, Iraq, Kuwait, Bahrain, Oman, and the Yemen are all descended from the pound sterling unit, while the currency units that are used in Saudi Arabia, Qatar, and the United Arab Emirates are all descended from the Maria Theresa Thaler. This largely explains the factor of ten difference in value on average between Bahrain, Kuwait and Oman on
Non-decimal currency accounting, because amounts are written down and calculated using the decimal numeral system (but when another numeral system is used, such as the vigesimal system that was common among ancient Mesoamerican civilizations or the sexagesimal system used by the ancient Mesopotamians, this advantage disappears). However, decimalised currencies also have disadvantages. The principal advantage of most non-decimal currencies is that they are more easily divided, particularly by numbers such as 3 and 8, than decimal currencies. A currency with 100 minor units to the major unit is divisible neither into 3 nor into 8, and furthermore 100 may be an uncomfortably