100 years is a century,but a decade is 10 years
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changed gradually
Intro to criminal justice textbook states 1970's
10010 = (102)10 = 1020
The 1880's, with 5 (Rutherford Hayes, James Garfield, Chester A. Arthur, Grover Cleveland, and Benjamin Harrison).
in one decade there are 10 years, so if you times 10 by 4 you will get 40 so there are 40 years in 4 decades.