## Explanation

To calculate $0.7 - 3.4$, follow these steps:

### Step 1: Convert to a Common Form

First, it may be easier to understand if we convert these decimal numbers into fraction form. However, for simplicity, we will proceed with decimal arithmetic here.

### Step 2: Perform the Subtraction

Since $0.7$ is less than $3.4$, the result will be negative. We can rewrite the subtraction as $-(3.4 - 0.7)$:

$0.7 - 3.4 = -(3.4 - 0.7)$### Step 3: Subtract the Smaller Number from the Larger Number

Perform the inner subtraction $3.4 - 0.7$:

$\begin{align*} 3.4 \\ - 0.7 \\ \hline 2.7 \end{align*}$### Step 4: Add the Negative Sign

Reapply the negative sign to our result:

$0.7 - 3.4 = -2.7$Therefore, the calculated result of **$0.7 - 3.4$ is $-2.7$**.