The answer to the question, as asked, is no one, since there were no number ones in, for example, the first decade of the fifteenth century!
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10 decades in 1 century
A decade is a period of 10 years. Therefore, 7 decades would be equal to 70 years. This is because you would multiply the number of decades (7) by the number of years in a decade (10) to get the total number of years (7 x 10 = 70).
Ten decades equals 100 years or one century.
there are 10 decades in one century so therefore 10 times 4 is 40
One hundred