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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To convert decades to months, you multiply the number of decades by the number of years in a decade and then by the number of months in a year. Since one decade equals 10 years and one year has 12 months, the calculation is: 3 decades × 10 years/decade × 12 months/year = 360 months. Therefore, 3 decades is equivalent to 360 months.
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