The years divided by 100 are not leap years unless these are divisible by 400.
So 19th century has only 24 leap years but 21st century has 25 as year 2000 was a leap year.
Seven tenths !
A century is 100 years, so one quarter of a century is twenty-five years.
Ten years is a decade. Twenty years is a score.
The twenty-first century started in the year 2001. As there was no "year 0" the last year of the 20th century (set of 100 years) was 2000.
The twenty first set of one hundred years since the birth of Christ.
The twenty-first century (21st or XXI) ranges from years 2001 to 2100, so until 2101 it is the 21st century.
Low interest rates during the first years of the twenty-first century allowed many Americans to become homeowners, driving the real estate market.
The Russian Revolutions all occurred in the first twenty years of the 20th century.
One hundred years is a century.Though we are in the year 2013, it is known as the twenty-first century.
The years 0-99 are referred to as the 1st century. The 1900's were referred to as the 20th century and therefore the year 2000 was referred to as the twenty first century. Sorry if this explanation doesn't make much sense or doesn't answer your question correctly.
False
The twenty first century is only 11 years old, as I type, so it may be a bit early to decide who the century's most famous person is, but so far it would appear to be Osama bin Laden.