April 10th is the 100th day of this year (2009). During leap years, however, the 100th day of those years will occur on April 9th. This type of information is obtained by consulting a Julian calendar - a calendar that shows, besides normal information, the number of days which have elapsed (and usually also how many are remaining) in the current year.
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One hundredth of a century is a year.
If you want that sort of precision then you need to specify whether you want the number of days in a solar year, a siderial year, a synodic year, a tropical year.
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The answer depends on when school started, how many holidays, how many teacher training (INSET in UK) days.
the 4 is the hundredth