Different countries changed at different times so you will need to specify which country.
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The decimal system refers to counting in tens and powers of tens and this system was used when Australia was colonised by Britain in 1788. Decimal coinage was introduced much later - in 1966.
It was developed in 1876. SO WAS UR NAN
1971 for decimal money here in England
It is measured to 4 decimal places.
The Roman numeral system was developed in ancient Rome around the 3rd century BC. It is believed to have been derived from the Etruscan numeral system.