From the year 1820 to 1890, there are seven decades. A decade is a period of ten years, so counting from 1820 to 1830 is one decade, 1830 to 1840 is the second decade, and so on until 1890. In total, that makes seven decades in the given time frame.
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12
1 year = 12 months 1 decade = 10 years = 10*12 = 120 months 10 decades = 10*120 = 1200 months
1 decade = 10 years 10 decades = 100 years Today is 2010. 10 decades ago, it was 1910 .
350 day is 1 year 50days.
1958