Base 10 Blocks: Part 2 - Practice identifying numbers and their expanded forms using visual representations of base-10 blocks.

Let's solve this step by step based on the Base 10 Blocks: Part 2 worksheet.

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🔢 Understanding Base-10 Blocks:

- 1 cube = 1
- 1 long (rod) = 10
- 1 flat (square) = 100
- 1 big cube (1000 cubes) = 1000

We will analyze each group of blocks and determine:
1. The total number represented.
2. Which expanded form is correct.

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## ✔ First Group (Top Left):

🔹 Blocks shown:

- 4 large cubes → 4 × 1000 = 4000
- 3 flats → 3 × 100 = 300
- 2 longs → 2 × 10 = 20
- 9 cubes → 9 × 1 = 9

🔹 Total:

4000 + 300 + 20 + 9 = 4329

✔ So, circle 4329 from the options:
3428, 4327, 4329 → ✔ Circle 4329

Now check the expanded form:
- Option 1: 4000 + 300 + 20 + 7 → ✘ (wrong units)
- Option 2: 4000 + 300 + 20 + 9 → ✔ Correct!

👉 Check the box: ☑️ 4000+300+20+9

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## ✔ Second Group (Bottom Left):

🔹 Blocks shown:

- 8 large cubes → 8 × 1000 = 8000
- 5 flats → 5 × 100 = 500
- 0 longs → 0 × 10 = 0
- 1 cube → 1 × 1 = 1

🔹 Total:

8000 + 500 + 0 + 1 = 8501

✔ So, circle 8501 from the options:
851, 8501, 8500 → ✔ Circle 8501

Now check the expanded form:
- Option 1: 8000 + 500 + 1 → ✔ Correct!
- Option 2: 8000 + 50 + 1 → ✘ (should be 500, not 50)

👉 Check the box: ☑️ 8000+500+1

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🟩 Final Answers:

#### First Set:
- Circle: 4329
- Check: 4000 + 300 + 20 + 9

#### Second Set:
- Circle: 8501
- Check: 8000 + 500 + 1

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✔ Summary:

| Group | Number Shown | Correct Expanded Form |
|------|---------------|------------------------|
| Top | 4329 | 4000 + 300 + 20 + 9 |
| Bottom | 8501 | 8000 + 500 + 1 |

You’ve now solved both problems correctly! 😊