There are 100 years in a century. A century is defined as 100 consecutive years. When you say the 1900s, you mean the 100 years that start with in 1900. The 1990s is a decade.
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1 century = 100 years :D
A century is 100 years One year = 1/100 century or 0.01 century
100 years = 1 century so 420 years = 4.2 centuries.
25 years because a century is 100 years and 1/4 of 100 is 25 and it is 69
one hundred years