Solve Decimal Addition: 0.7 + 0.4 Using Visual Blocks

$0.7+0.4=$

To solve this problem, we will add the two decimal fractions $0.7$ and $0.4$.

Let's break down the process:

• Step 1: Align the numbers by their decimal points:
  $\phantom{+}0.7$
  $+0.4$
• Step 2: Add the numbers column by column starting from the rightmost place (tenths place):
  $7 + 4 = 11$
• Step 3: Write down the 1 in the tenths place and carry over 1 to the units place. There is no whole number component in this addition, so simply add the carry to $0$ which is $1 + 0 = 1$.
• Step 4: Combine the results to find the total: $1.1$.

Thus, the sum of $0.7$ and $0.4$ is $\mathbf{1.1}$.

The correct choice is 1: 1.1.