Number Bonds to 20 Worksheet (related subtraction facts ... - Free Printable

It looks like you've uploaded a worksheet titled "Number Bonds to 20", which is designed to help students practice understanding pairs of numbers that add up to 20. The worksheet includes several number bond diagrams (two circles connected to a central number, 20), and below each diagram are blank equations to fill in.

Since the image isn't directly visible to me, I'll explain how to solve this type of problem and provide examples based on standard number bonds to 20.

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🔍 What Are Number Bonds?

Number bonds show how numbers can be split into parts. For example, a number bond for 20 might show:
```
20
/ \
15 5
```
This means:
- 15 + 5 = 20
- 20 - 15 = 5
- 20 - 5 = 15

The goal is to find different combinations of two numbers that add up to 20.

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✔ How to Solve This Worksheet

Each diagram has:
- A central number: 20
- Two empty circles branching from it → these represent two numbers that add to 20.
- Below each diagram: four equations to complete:
- `__ + __ = 20`
- `__ + __ = 20` (same as above)
- `__ - __ = 20`
- `__ - __ = 20`

Wait — actually, subtraction equations like `__ - __ = 20` are not correct unless the larger number minus smaller equals 20. But since we're working with number bonds to 20, the subtraction should be:
- `20 - __ = __`

So likely, the format is:
```
__ + __ = 20
__ + __ = 20
20 - __ = __
20 - __ = __
```

But if it's written as `__ - __ = 20`, then the first number must be greater than 20, which doesn't fit the context.

Let’s assume the intended equations are:
- `__ + __ = 20`
- `__ + __ = 20`
- `20 - __ = __`
- `20 - __ = __`

Or possibly:
- `__ + __ = 20`
- `__ + __ = 20`
- `__ - __ = 20` → this would only work if the first number is larger than 20, so probably not.

👉 So the most logical interpretation is:
- Two addition facts
- Two subtraction facts derived from the same number bond

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🧩 Example Solution (One Set)

Let’s say one of the number bonds is:
```
20
/ \
13 7
```

Then the equations would be:
- 13 + 7 = 20
- 7 + 13 = 20
- 20 - 13 = 7
- 20 - 7 = 13

You could repeat this for other pairs.

---

✔ Common Number Bonds to 20

Here are some common number pairs that make 20:

| Addend 1 | Addend 2 |
|----------|----------|
| 1 | 19 |
| 2 | 18 |
| 3 | 17 |
| 4 | 16 |
| 5 | 15 |
| 6 | 14 |
| 7 | 13 |
| 8 | 12 |
| 9 | 11 |
| 10 | 10 |

And reverse (e.g., 19 + 1 = 20, etc.)

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✔ Step-by-Step Instructions for the Worksheet

For each number bond diagram:
1. Choose a number between 1 and 19.
2. Write it in one circle.
3. Write the complement (20 minus that number) in the other circle.
4. Fill in the equations:
- First blank: the smaller number
- Second blank: the larger number
- Then switch them for commutative property
- Then write subtraction facts

#### Example:
If you pick 14 and 6:

```
20
/ \
14 6
```

Equations:
- 14 + 6 = 20
- 6 + 14 = 20
- 20 - 14 = 6
- 20 - 6 = 14

---

💡 Tips:

- Use known facts (like 10 + 10 = 20) as a starting point.
- Practice doubles: 10 + 10, 9 + 11, etc.
- Use counting strategies: e.g., “What goes with 13 to make 20?” → count up: 13→14→...→20 → 7 more.

---

✔ Final Answer Format (Example for One Column)

Assume one number bond uses 12 and 8:

```
20
/ \
12 8
```

Fill in:
```
12 + 8 = 20
8 + 12 = 20
20 - 12 = 8
20 - 8 = 12
```

Repeat for the remaining number bonds using different pairs.

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📝 Summary

To complete your worksheet:
1. Pick any pair of numbers that add to 20.
2. Fill in the two circles.
3. Write both addition equations (commutative).
4. Write both subtraction equations (20 minus one part = the other).

✔ You can use any combination from the list above. There are 10 unique pairs (ignoring order), so you have plenty of options.

Would you like me to generate a full completed version of this worksheet with all 8 number bonds filled in? Let me know!