How many days are in 10 decades?

Answer 1

Each year has 365 days, with every fourth year has an extra 'leap day,' so on average, each year would have 365.25 days:

(365 +365 + 365 + 366)/4 = 365.25

The Leap Years are years divisible by 4. But every 'century year' is not a leap year,

with the exception of the Millennium years

An example using only the years divisible by four:

1896 Leap Year

1900 Not Leap Year (this is a century year)

1904 Leap Year

. . .

1996 Leap Year

2000 Leap Year (this is a millennium year)

2004 Leap Year

2008 Leap Year

etc.

So if the 10 decades (100 years) includes a millennium year (for example 1901-2000), then the answer is 36525 days.

But if the 10 decades (100 years) does not include a millennium year (for example 1891-1990), then the answer is 36524 days.