1000 years. One century is 100 years.
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A decade is 10 years and so 40 times 10 = 400 years which is 4 centuries
1000 very simple multiply 100 (that's how many years are in a century) muliply that by 10.
Ten of them because 10 times 100 years = 1000 years
There are 400 years in four centuries.
150 centuries.