Solve the Decimal Addition: 0.2 + 0.1

To solve this problem, we need to add the decimal numbers $0.2$ and $0.1$.

Here are the steps to perform the addition:

• Step 1: Align the numbers by their decimal points:
      $0.2$
  + $0.1$
• Step 2: Start adding from the rightmost digit to the left:
• The tenths column contains 2 tenths (from $0.2$) and 1 tenth (from $0.1$), and adding these gives 3 tenths. There is no carryover since the result is below 10 tenths.
• The single whole number place doesn't have digits to sum aside from the carry, which in this case, is zero.
• Step 3: The sum of $0.2 + 0.1$ is $0.3$.

Therefore, the solution to the problem is $0.3$.