10 centuries = 10 * 100 years = 1000 years
1000 years * 365 days = 365000 days
365000 days * 24 hours = 8760000 hours
8760000 hours * 60 minutes = 525600000 minutes
525600000 minutes * 60 seconds = 31536000000 seconds
31536000000 seconds * 1000 = 31536000000000 miliseconds
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there are 1.08x10^7 miliseconds in 3 hours, or written, 10,800,000 miliseconds.
A decade is 10 years and so 40 times 10 = 400 years which is 4 centuries
400/10 = 40
1000 very simple multiply 100 (that's how many years are in a century) muliply that by 10.
There are 500/10 = 50 decades