Solve Decimal Addition: 0.61 + 0.20 Step-by-Step

To solve this problem, we'll follow these steps:

• Align the numbers by their decimal points.
• Add the numbers starting from the rightmost column.
• Ensure each column's sum does not exceed ten; if it does, carry over to the next column.

Now, let's work through each step:
Step 1: Align the decimals: 0.61 + 0.20
Step 2: Add the hundredths place: $1 + 0 = 1$.
Step 3: Add the tenths place: $6 + 2 = 8$.
Step 4: Add the units (whole number) place: There are no whole numbers to add here, so the sum remains as is.

Therefore, the solution to the problem is $0.81$.