5 decades = 50 years = 600 months
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5 decades would be 50 years. Multiply 50 and 12 for months. Your answer would be that there are 600 months in 5 decades.
A decade is equal to 10 years. Convert the decades to years. The idea is to subtract the specified number of years from 1826.
A "decade" refers to a period of 10 years, so three decades would be equal to 30 years. Three decades before 1969 would be 1939.
1946.
By multiplying by converstion factors. 1 decade = 10 years, and 1 year = 12 months. If it helps, you can set up a line and put dimensions which are equal to each other on top/bottom of the line. The line acts like the line in a fraction.10 years | 12 months | 5 decade |--------------------------------------------- = 600 months1 decade | 1 year