>>10408182

To understand what's happening to the numbers after the decimal when you multiply the number by 10, suppose it was 0.99 instead.

x=0.99

10x=9.9 <--- That's 9.90, not 9.99

Even though both 9.999... and 0.999... stretch to infinity, the numbers after the decimal in 9.999... are still smaller because there are different orders of infinity.

The irrational numbers between integers are a higher order of infinity than the integers themselves, for example.