Addition worksheet with a starry design, guiding children to fill in blanks for adding multiple numbers step by step.

Let's solve this step-by-step.

We are given a sequence of numbers to add:

3 + 2 + 5 + 5 + 1 + 7 + 8 + 2 + 6

The diagram shows a tree-like structure where we need to group and add numbers in pairs, then keep adding the results upward until we get a final sum.

---

Step 1: Understand the structure

The top row has the numbers:
```
3 + 2 + 5 + 5 + 1 + 7 + 8 + 2 + 6
```

Lines connect numbers to boxes below, showing which numbers are added together.

Let’s follow the connections.

---

Step 2: First level (pairwise additions)

From the diagram:

- 3 + 2 → goes to first box
- 5 + 5 → goes to second box
- 1 + 7 → goes to third box
- 8 + 2 → goes to fourth box
- 6 is alone? Wait — no, look again.

Wait! The diagram shows five boxes on the first level. But there are nine numbers, so likely grouped as:

Let’s trace the lines:

- 3 and 2 → connected to first blank
- 5 and 5 → connected to second blank
- 1 and 7 → connected to third blank
- 8 and 2 → connected to fourth blank
- 6 → connected to fifth blank (by itself)

So the first level additions are:

1. 3 + 2 = 5
2. 5 + 5 = 10
3. 1 + 7 = 8
4. 8 + 2 = 10
5. 6 = 6

So the first row of blanks becomes:

```
5 + 10 + 8 + 10 + 6
```

---

Step 3: Second level

Now, the next row has four boxes, with connections:

- 5 and 10 → go to first box
- 8 → goes to second box (alone?)
- 10 and 6 → go to third box?

Wait — let's see the lines:

Looking at the diagram:

- From the first two boxes (5 and 10) → they both connect to one box below → so 5 + 10 = ?
- Then 8 connects to a box by itself?
- Then 10 and 6 connect to another box → 10 + 6 = ?

But there are only three boxes in the second row.

Wait — actually, from the image:

It seems like:

- Box 1 (from 3+2=5) and Box 2 (from 5+5=10) → both feed into one box → so 5 + 10 = 15
- Box 3 (1+7=8) → feeds into a separate box → just 8
- Box 4 (8+2=10) and Box 5 (6) → both feed into another box → 10 + 6 = 16

So second-level boxes:

1. 5 + 10 = 15
2. 8 = 8
3. 10 + 6 = 16

Wait — but there are three boxes in the second row, and three connections.

But looking at the diagram again: the middle number (8) is not connected to any other — so it stays as 8.

So the second row becomes:

```
15 + 8 + 16
```

Wait — but the diagram shows only two boxes in the second row? No, let's count:

Actually, looking carefully:

- After the first level (5 boxes), the next row has three boxes.
- The connections:
- Leftmost: 5 and 10 → combined → 15
- Middle: 8 → stands alone → 8
- Right: 10 and 6 → combined → 16

So the second row is:

```
15 + 8 + 16
```

But now, the next level (third row) has two boxes.

Connections:

- 15 and 8 → combine → 15 + 8 = 23
- 16 → stands alone? No — wait, the diagram shows:

From the second row:

- 15 and 8 → both go to one box
- 16 → goes to another box

So:

- 15 + 8 = 23
- 16 = 16

So third row: 23 + 16

Then the final box is:

- 23 + 16 = 39

---

Final Answer

Let’s fill in all the blanks:

#### First level:
- 3 + 2 = 5
- 5 + 5 = 10
- 1 + 7 = 8
- 8 + 2 = 10
- 6 = 6

→ So first row blanks:
5 + 10 + 8 + 10 + 6

#### Second level:
- 5 + 10 = 15
- 8 = 8
- 10 + 6 = 16

→ Second row:
15 + 8 + 16

#### Third level:
- 15 + 8 = 23
- 16 = 16

→ Third row:
23 + 16

#### Final answer:
- 23 + 16 = 39

---

✔ Final Answer: 39

Let’s verify total sum directly:

3 + 2 + 5 + 5 + 1 + 7 + 8 + 2 + 6
= (3+2)=5; (5+5)=10; (1+7)=8; (8+2)=10; (6)=6
Total: 5 + 10 + 8 + 10 + 6 = 39

Yes, correct.

---

Fill-in-the-blanks solution:

```
3 + 2 + 5 + 5 + 1 + 7 + 8 + 2 + 6
↓ ↓ ↓ ↓ ↓ ↓ ↓
5 10 8 10 6
\ / | \ /
15 8 16
\ | /
23 16
\ /
39
```

So the blanks are filled as:

- First row: 5, 10, 8, 10, 6
- Second row: 15, 8, 16
- Third row: 23, 16
- Final box: 39

✔ Answer: 39