But, but... percentages are already fractions. Per cent = "out of a hundred".
The % symbol even looks like a fraction to remind everyone.
Now, simplifying fractions from 90/100 to 9/10—in spite of it literally being removing a zero from each side—does seem to cause some real problems.
How are you at thinking about years, decades, and centuries?
If we take it step by step:—
Looking at the same thing another way:—
Bringing in the comparison from earlier:—
Are these familiar enough to make sense as a parallel, or just further irrelevant confusion?