Here they are:
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MCMLI. M = 1000; C = 100; L = 50; I = 1 M = 1000 CM = 100 before 1000 = 900; 900 + 1000 = 1900 L = 50; 50 + 1900 = 1950 I = 1; 1 + 1950 = 1951
A century is a period of 100 years. A decade is 10 years.* Historical periods are often defined as a century. However, because there was no 0th century, the century number is always 1 higher than the first two digits of the year number (e.g. 1950 is in the 20th century) except for years ending in 00, which are in the preceding century (1900 is in the 19th century with 1801-1899).
In 2014, if a person is 64 years old, then he was born in 1950.
As there was an even number of years, there is no single middle year. So 1950 and 1951 were the middle years. You could therefore say that the year running from the 1st of July 1950 to the 30th of June 1951 was the middle year of the 20th century.
1956 is in the 1950's In fact, 1956-1965 is ten years, meaning a decade.