How are you at thinking about years, decades, and centuries?

If we take it step by step:—

• 10 years of a century is ten years out of a hundred.
• 10% is ten out of a hundred.
• So 10 years is 10% of a century.

 

Looking at the same thing another way:—

• 10 years is a also a decade.
• There are 10 decades in a century.
• So one decade is one tenth (1/10) of a century.

 

Bringing in the comparison from earlier:—

• 90% of a century is 90 years, or 9 decades.
• 9 decades is nine tenths (9/10) of a century.
• 110% of a century is 110 years, or 11 decades.
• 11 decades is eleven tenths (11/10) of a century.

 

Are these familiar enough to make sense as a parallel, or just further irrelevant confusion?