Addition Strategies: Base-Ten Blocks Worksheet | Teach Starter - Free Printable

Let's solve the problems on this "Addition Strategies: Base-Ten Blocks" worksheet step by step.

---

🔹 Understanding Base-Ten Blocks:

- Each small square (unit block) = 1
- A long rod of 10 squares (ten block) = 10
- When you have 10 unit blocks, you can regroup them into 1 ten block.

We are to:
1. Add the base-ten blocks.
2. Regroup if needed (e.g., 10 ones → 1 ten).
3. Draw a picture showing the regrouping.
4. Write the answer in standard form.

---

🔹 Problem 1:

#### Number Sentence:
```
□□□
□□□ + □□□
□□□
```

Let’s count the blocks:

- Left side: 3 rows × 3 squares = 9 unit blocks
- Right side: 3 unit blocks

So, total = 9 + 3 = 12

Now, regroup:
We have 12 unit blocks → 1 ten and 2 ones

#### Drawing:
- Draw 1 ten rod (a vertical line of 10 squares)
- Draw 2 separate unit squares

#### Answer:
12

---

🔹 Problem 2:

#### Number Sentence:
```
□□□
□□□ + □□□□
□□□
```

Count the blocks:

- Left side: 3 rows × 3 squares = 9 unit blocks
- Right side: 4 unit blocks

Total = 9 + 4 = 13

Regroup:
13 units → 1 ten and 3 ones

#### Drawing:
- Draw 1 ten rod
- Draw 3 separate unit squares

#### Answer:
13

---

✔ Final Answers:

| Number Sentence | Drawing (Description) | Answer |
|------------------|-------------------------------------------|--------|
| 1. 9 + 3 | 1 ten rod + 2 ones | 12 |
| 2. 9 + 4 | 1 ten rod + 3 ones | 13 |

> Note: Since we can't draw here, the student should sketch:
> - A vertical bar of 10 squares for the ten.
> - Then 2 or 3 individual squares beside it for the ones.

---

📝 Summary:

- Problem 1: 9 + 3 = 12 → 1 ten + 2 ones
- Problem 2: 9 + 4 = 13 → 1 ten + 3 ones

✔ These problems teach regrouping from ones to tens when adding.

Let me know if you'd like a printable version or visual drawing guide!