Solve Decimal Addition: 0.1 + 0.2 Step-by-Step

To solve this problem, let's perform the addition of the two decimal numbers $0.1$ and $0.2$ step-by-step.

Step 1: Align the decimal points of the numbers.

We write the numbers as:

$0.1$

$+0.2$

Here, the decimal points are already aligned.

Step 2: Add the numbers column by column starting from the rightmost side, which is the decimal fraction part.

$0.1$ consists of 1 in the tenths place, and $0.2$ consists of 2 in the tenths place. By adding these:

• $0.1 + 0.2 = 0.3$

Thus, the sum of $0.1$ and $0.2$ is $0.3$.

Looking at the answer choices, the correct choice is:

• Choice 2: $0.3$

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