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The years 0 to the end of 999 are the 'first century'. Counting up from there, 1350 is in the '14th Century'.
Two right triangles. And a fifth grader knows that.
10 years.
A period of 25 years is called a "quarter-century." This term is derived from the fact that a century is made up of 100 years, so a quarter-century represents a quarter of that time span. It is commonly used in various contexts, such as history, planning, and forecasting.
Every 100 years is called a century, made up of 10 decades.