The recurring decimal 0.999… (the digit 9 repeating for ever) is exactly equal to:

Let $x=0.999$…. Then $10x=9.999$… and subtracting gives $9x=9$, so $x=1$. Another way: 1/3 = 0.333…, and multiplying both sides by 3 gives 1 = 0.999…. The two decimals are different names for the same number, not two nearby numbers.