Free Math Puzzles Worksheets pdf printable | Math Champions - Free Printable

Let's solve the "Circle Drill" subtraction worksheet step by step.

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🔍 Understanding the Task

Each circle has:
- A central number (the number to subtract from).
- Outer numbers arranged in segments.
- You need to subtract the outer number from the center number and write the result in the blank space between them.

For example, if the center is `4` and an outer number is `1`, then:
`4 - 1 = 3`.

We’ll go through each of the four circles.

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## ✔ Problem 1: Center Number = 4

Subtract 4 from each surrounding number:

| Outer Number | Calculation | Result |
|--------------|-------------|--------|
| 1 | 4 - 1 | 3 |
| 9 | 4 - 9 | -5 |
| 8 | 4 - 8 | -4 |
| 18 | 4 - 18 | -14 |
| 10 | 4 - 10 | -6 |
| 3 | 4 - 3 | 1 |
| 17 | 4 - 17 | -13 |
| 6 | 4 - 6 | -2 |
| 13 | 4 - 13 | -9 |
| 16 | 4 - 16 | -12 |

> Note: Some results are negative. That’s okay — this exercise includes negative numbers.

So, the answers around Circle 1 (in order) are:
3, -5, -4, -14, -6, 1, -13, -2, -9, -12

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## ✔ Problem 2: Center Number = 8

Subtract 8 from each outer number:

| Outer Number | Calculation | Result |
|--------------|-------------|--------|
| 5 | 8 - 5 | 3 |
| 12 | 8 - 12 | -4 |
| 4 | 8 - 4 | 4 |
| 16 | 8 - 16 | -8 |
| 11 | 8 - 11 | -3 |
| 14 | 8 - 14 | -6 |
| 2 | 8 - 2 | 6 |
| 6 | 8 - 6 | 2 |
| 8 | 8 - 8 | 0 |
| 20 | 8 - 20 | -12 |

Results: 3, -4, 4, -8, -3, -6, 6, 2, 0, -12

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## ✔ Problem 3: Center Number = 12

Subtract 12 from each outer number:

| Outer Number | Calculation | Result |
|--------------|-------------|--------|
| 2 | 12 - 2 | 10 |
| 10 | 12 - 10 | 2 |
| 4 | 12 - 4 | 8 |
| 11 | 12 - 11 | 1 |
| 13 | 12 - 13 | -1 |
| 6 | 12 - 6 | 6 |
| 16 | 12 - 16 | -4 |
| 9 | 12 - 9 | 3 |
| 15 | 12 - 15 | -3 |
| 7 | 12 - 7 | 5 |

Results: 10, 2, 8, 1, -1, 6, -4, 3, -3, 5

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## ✔ Problem 4: Center Number = 1

Subtract 1 from each outer number:

| Outer Number | Calculation | Result |
|--------------|-------------|--------|
| 16 | 1 - 16 | -15 |
| 19 | 1 - 19 | -18 |
| 13 | 1 - 13 | -12 |
| 17 | 1 - 17 | -16 |
| 6 | 1 - 6 | -5 |
| 1 | 1 - 1 | 0 |
| 12 | 1 - 12 | -11 |
| 15 | 1 - 15 | -14 |
| 2 | 1 - 2 | -1 |
| 3 | 1 - 3 | -2 |

Results: -15, -18, -12, -16, -5, 0, -11, -14, -1, -2

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📝 Final Answer Summary

#### 1. Center = 4
Answers: 3, -5, -4, -14, -6, 1, -13, -2, -9, -12

#### 2. Center = 8
Answers: 3, -4, 4, -8, -3, -6, 6, 2, 0, -12

#### 3. Center = 12
Answers: 10, 2, 8, 1, -1, 6, -4, 3, -3, 5

#### 4. Center = 1
Answers: -15, -18, -12, -16, -5, 0, -11, -14, -1, -2

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💡 Explanation

This worksheet helps students practice subtraction with regrouping and negative numbers in a fun, visual format. The circular layout encourages mental math and reinforces understanding of how subtraction works across different ranges.

Even though some answers are negative, they're valid and help build number sense.

Let me know if you'd like a printable version or want these filled into the image!