\(0.123\\\\digit\ in\ the\ tenths\ place\ is\ \boxed1\)
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
\(0.\underline{1}23\approx\boxed{0.1}\)
