At the same time, 1, 2,5 have different positions in coins. Generally, it is 1 (and 10, 100 and so on. ) is the most important, followed by 5 and 2 is the least important. The national circulation is also 1, at most, 5 times and at least 2 times.
The four numbers 1, 2,5, 10 are the most commonly used in coin denominations at all times and in all countries. Generally speaking, when a country determines the denomination of a coin, the relationship between the highest denomination and other denominations is an integer multiple.
The face value of money is designed according to the combination principle of mathematics. From 1 to 10, there are important numbers and unimportant numbers, and 1, 2,5, 10 are important numbers. With these numbers, you can get other numbers, such as 65438, with the least addition and subtraction.
The rest are "unimportant numbers". If you change any of the four "important numbers" into "unimportant numbers", then some numbers will have to be added and subtracted more than twice to get them, which is more complicated, especially for people with poor arithmetic, and it is too inconvenient for daily use.
Extended data
The fifth set of RMB 1999 will be issued after September 28th. Since the reform and opening up, with the sustained, healthy and rapid development of the socialist market economy, the social demand for cash is also increasing.
The design and printing of the fourth set of RMB were limited by the conditions at that time, and there were some shortcomings, such as simple anti-counterfeiting measures, which were not conducive to the anti-counterfeiting of RMB; Lack of machine-readable performance is not conducive to the automatic processing of banknotes and so on. These all need to issue a new version of RMB in time.
1999 65438+ 10/month 1, the People's Bank of China successively issued the fifth set of RMB. * * There are eight kinds of RMB: 1, 50, 1 yuan, 5 yuan, 10, 20 yuan, 50 yuan and 100. According to the needs of market circulation, the fifth set of RMB increased the denomination of 20 yuan and cancelled the denomination of 2 yuan, making the denomination structure more reasonable. ?
The People's Bank of China is scheduled to issue the fifth set of RMB notes in 50 yuan, 20 yuan, 10 yuan, 1 yuan and 20 19 edition 1 yuan, 50 cents and 1 minute on August 30th, 2065438.
Baidu Encyclopedia-RMB