all right a turtle wants to reach a destination one meter away:

first it makes a nineth of the way, then it makes a nineth of whats left and keeps doing a ninenth of whats left forever

will it arrive its destination?

no since in other words shell always be one tenth short of finish line

this proves 0.999... is not equal to 1

or would you say a turtle waking 0.1 of whats left forever will reach destination as well