The original image contains handwritten mathematical calculations. Analyze the image and provide a structured interpretation of the mathematical expressions and calculations present.

The image contains several handwritten mathematical expressions and calculations. It appears to be a page from a notebook with arithmetic operations. Below is a breakdown:

1. Top Line Expression: `1395 \(\cdot\) 62 - 603 \(\cdot\) 25 - 960 : 24 =`
* This line presents a sequence of multiplication and division operations, followed by subtraction. It looks like a problem that is either in progress or intended to be solved.

2. Top Left Calculation Block:

395
x 52
-----
790

* This block shows a multiplication in progress. It seems to be the multiplication of `395` by `52`. The result `790` is the partial product of `395` multiplied by `2` (the units digit of `52`). The next step would be to multiply `395` by `50` and add the results.

3. Top Right Calculation Block:

395
x 52
-----

* This block also shows the setup for the multiplication of `395` by `52`, identical to the top left block. It's likely a repetition or a different attempt at the same calculation.

4. Middle Line Expression: `395 \(\cdot\) 52 - 603 \(\cdot\) 25 - 960 : 24 =`
* This line is a restatement of the first expression, with the first multiplication `1395 \(\cdot\) 62` replaced by `395 \(\cdot\) 52`. This suggests a potential correction or a new problem being set up.

5. Bottom Line Expression: `256 \(\cdot\) 407 - 23078 : 298 =`
* This line presents another arithmetic problem involving multiplication and division, followed by subtraction. The `23078` appears to have some scribbling over it, but the digits are discernible.

Summary of Operations Observed:
* Multiplication \(`\cdot`, `x`\)
* Subtraction (`-`)
* Division (`:`, `|__` for long division setup)
* Addition (implied in the multiplication process)

The image primarily displays unfinished or in-progress arithmetic problems, showing the setup for multiplication and full expressions for calculation.