# How Long Is a Decade and a Century

The passage of time is measured using different parameters, some of which include decade and century.

Therefore, to be accurate in your statistical analysis, you need to know how long is a decade and a century.

Proper noting down records such as decades and centuries helps you appreciate your progress, the progress of a nation and a continent.

## How Long is a Decade?

The word decade has its origin in ancient Greek and means a group of ten.

A decade is simply ten consecutive years.

Like the greek definition, a decade is a group of ten years that follow each other.

Therefore, it is right to say that from the year 2000 to the year 2022 has been two decades.

This is because there are twenty-two years between year 2000 and the year 2022. So there are also two groups of tens in twenty-two years.

These two groups of tens in 2022 make the two decades.

It is suitable to observe up to nine decades; after the ninth decade, there is a change in the names you can call these clusters of years.

## How Long is a Century

The word decade has its origin in the ancient Greek word- Centum and means one hundred years.

A Century is simply one hundred consecutive years, often broken down into decades of ten years each.

Like the greek definition, a century is a group of hundred years that follow each other.

Therefore, it is right to say that from the year 1900 to the year 2000 has been one century.

Humans often denote generations using centuries, so it is familiar to older adults to refer to people born around the year 2000 as the younger generation.

There are two viewpoints on the nature of standard centuries. One is based on strict construction, while the other is based on popular perception.

According to the strict construction, the 1st recorded century in human history began with AD 1 and ended with AD 100. The 2nd century covered the years 101 to 200, with the same pattern continuing until the point we now are.

In this model, the next century starts with the year that ends with “01” and ends with the year that ends with “00”.

For example, the 20th century comprises the year 1901 to the year 2000.

## How Long Is a Decade and a Century

A decade is made up of ten years. One decade comprises year one to year nine, and the tenth is called the decade year.

On the other hand, a century is made up of one hundred years.

Every century comprises hundred years grouped into decades. This, therefore, means that a century is equal to ten decades.

With this in mind, you can see that a century is more significant than a decade by ninety.

## How to Calculate How Long a Decade and a Century is

The formula for calculating a century’s length is more straightforward than the popular high school mn = 100xn – 99.

To calculate centuries, keep in mind that the first century is from 1/1/1 to 12/31/100, the 2nd century is from 101 and ends in 200, and the trend continues.

The 21st-century began on January 1, 2001, and will end on December 31, 2100.

Therefore 2022 is a member of the 21st century.

On the other hand, you can calculate a decade using two methods.

The first method requires you to assume that a decade begins with a year with the last zero and ends in a year with the previous 9, such as the year 1880 in the 19th century.

The other method insinuates that a decade begins with the year with its last number as one and ends in the year with the previous number as 0.

For example, the 10th decade of the 20th century begins in 2011 and ends in 2020, so 2020 is the last year of this decade.

Likewise, the 1st decade of the 21st century begins in 2021 and ends in 2030, so 2030 is the last year of this decade.