how do you find out what century a certain year is in?

We are now in the 21st century.

2011 is in the 21st century.

The first century was from 1 - 100.
The year 50 was in the first century.

The second century was from 101 to 200.
The year 175 was in the second century.

To Find out this....

If the year is beginning with 10 the century will be 11.examples are given below.
2011-21st century
1990-20th century
1450-15th century

To find out which century a specific year falls in, you can follow these steps:

Step 1: Divide the year by 100 to get a whole number.
For example, if the year is 2021, divide it by 100: 2021 ÷ 100 = 20.

Step 2: If the year is evenly divisible by 100, add 1 to the result obtained in Step 1.
If the year is not divisible by 100, move to the next step.
Using the previous example, since 2021 is not divisible by 100, we move to the next step.

Step 3: Round up the result obtained in Step 1 or Step 2 to the nearest whole number.
Using the example from Step 1, which was 20, this number remains the same for Step 3 since there are no decimal places to round up.

Step 4: Combine the result from Step 3 with the suffix "th" to determine the century.
In our example, combining the result of 20 with the suffix "th" gives us the answer: 20th century.

So, the year 2021 falls in the 21st century.

Remember that there is no 0th century. The 1st century started from the year 1 AD. Therefore, the 20th century covers the years from 1901 to 2000.