Answer :
Place of the thousandth digit in 2.0124 is the second 2. After rounding it to the nearest thousandths we'll get 2.012. It's because 2.0124 is closer to 2.012 than to 2.013.
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).
2.0124 ≈ 2.012
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
2.0124 ≈ 2.012