Cover the last 2 digits and add 1. So 2010, add 1 to 20 and it tells you that it is the 21st century. 1566, add 1 to 15 and it is the 16th century. If there are less than 2 digits then it will be the 1st century.
The 21st century. Think of it this way. The 1st century is years 1-100. So that's 1. For the rest, simply take the first two digits in the year, in this case 20, and add one. So 20 + 1 = 21, the 21st century.
The 18th century. Just add one to the first two digits of the year in question. (1750--> 17 +1=18) This century, for instance is the 21st (2010-->20+1=21)-Akilae
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If the last two digits are not both zeroes, then you cover up the last two numbers then to the remaining number you add one. Example the year 1679 would be in the 17th century. If they are both zeroes, then just cover up the last two digits and use the digits you see. Example the year 1600 would be in the 16th century.
The 20th century. We add 1 to the first two digits to get the century. This is since the first century is classed as the years 0 to 999, the 2nd century the years 1000 to 1999 etc.
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because year 1 to 99 was the first, so it still counts as a century .(by the way, if you don't know, a century is 100 years.) take out the last 2 digits in the year you're in and add 1, and that's what century you're in. for example, the year now is 2010. take away the 10. you get 20,+1=21. this puts us in the 21st century.
2014 ( The sum of the digits = 7, a prime number )
A century has 100 years, so just add 100 to the current year.
It's the 19th century. Always look at the two number in the year, and add one. That will give you this expression.