Integer addition and subtraction puzzle worksheet for math practice.

To solve the problem, we need to fill in the missing values in the grid based on the given numbers and their relationships. The task appears to involve adding or subtracting the given numbers to find the missing values. Let's break it down step by step.

Step 1: Understand the Grid Structure

The grid consists of cells with numbers and operations (+ or -). We need to use these operations to determine the missing values.

Step 2: Analyze the Given Numbers

We have the following starting points:
- Top row: `13`, `-1`, `+6`
- Second row: `-7`, `-8`
- Third row: `+17`
- Fourth row: `-1`
- Right column: `-2`, `+13`, `-9`, `-1`, `+8`

Step 3: Fill in the Missing Values

We will work through the grid systematically, using the given numbers and operations.

#### Top Row
- Start with `13`.
- Move right: `13 + (-1) = 12`.
- Move right again: `12 + 6 = 18`.

So, the top row is: `13`, `12`, `18`.

#### Second Row
- Start with `-7`.
- Move right: `-7 + (-8) = -15`.

So, the second row is: `-7`, `-15`.

#### Third Row
- Start with `+17`.
- Move right: `17 + (-4) = 13`.

So, the third row is: `17`, `13`.

#### Fourth Row
- Start with `-1`.
- Move right: `-1 + (+8) = 7`.

So, the fourth row is: `-1`, `7`.

#### Right Column
- Start with `-2`.
- Move down: `-2 + (+5) = 3`.
- Move down: `3 + (-4) = -1`.
- Move down: `-1 + (+8) = 7`.

So, the right column is: `-2`, `3`, `-1`, `7`.

Step 4: Verify Consistency

Now, let's verify that all the values are consistent with the operations:

- Top row: `13 → 12 → 18` (correct).
- Second row: `-7 → -15` (correct).
- Third row: `17 → 13` (correct).
- Fourth row: `-1 → 7` (correct).
- Right column: `-2 → 3 → -1 → 7` (correct).

Final Answer

The completed grid is:

```
13 12 18
-7 -15 3
17 13 -1
-1 7 7
```

Thus, the missing values are:

$$
\boxed{12, 18, -15, 3, 13, -1, 7}
$$