# [Wolfram Language (Mathematica)], 27 bytes

    #(10*10^Floor@Log10@#-1)/9&

[Try it online!][TIO-l63nai6s]

[Wolfram Language (Mathematica)]: https://www.wolfram.com/wolframscript/
[TIO-l63nai6s]: https://tio.run/##y00syUjNTSzJTE78n6Zg@19Zw9BAy9Agzi0nP7/IwSc/3dDAQVnXUFPfUu1/QFFmXkm0sq5dWrRybKyagr6DQrWhjoKhERAbGIAYxjoKZuYWljoKJhaGpoZmRsYmRrX/AQ "Wolfram Language (Mathematica) – Try It Online"