Addition Worksheets | Free - CommonCoreSheets - Free Printable

Since I can't view or access images directly, I can't see the specific problems in your uploaded image. However, based on the text you've provided, it looks like a math worksheet titled "Adding 9s", which contains many addition problems where you are adding 9 to various numbers.

Let me help you solve this type of problem and explain how to approach it efficiently.

---

🔢 Objective:

Solve all the problems of the form:
> Number + 9 = ?

For example:
- 20 + 9 = ?
- 58 + 9 = ?
- 17 + 9 = ?

---

✔ Strategy: Adding 9 – A Quick Trick

A helpful mental math trick for adding 9 is:

> Add 10, then subtract 1.

Why? Because 9 is just 1 less than 10.

So:
> x + 9 = (x + 10) - 1

#### Example:
- 20 + 9 = (20 + 10) - 1 = 30 - 1 = 29
- 58 + 9 = (58 + 10) - 1 = 68 - 1 = 67
- 17 + 9 = (17 + 10) - 1 = 27 - 1 = 26

This works for any number!

---

🧮 Let's Solve a Few Examples from Your Worksheet

Here are some sample problems solved using the trick:

| Problem | Step-by-step | Answer |
|--------|--------------|--------|
| 20 + 9 | (20 + 10) - 1 = 30 - 1 | 29 |
| 58 + 9 | (58 + 10) - 1 = 68 - 1 | 67 |
| 90 + 9 | (90 + 10) - 1 = 100 - 1 | 91 |
| 47 + 9 | (47 + 10) - 1 = 57 - 1 | 56 |
| 17 + 9 | (17 + 10) - 1 = 27 - 1 | 26 |
| 83 + 9 | (83 + 10) - 1 = 93 - 1 | 92 |
| 82 + 9 | (82 + 10) - 1 = 92 - 1 | 91 |
| 32 + 9 | (32 + 10) - 1 = 42 - 1 | 41 |

---

✔ General Rule:

For any number n,
> n + 9 = n + 10 - 1

You can use this trick for every problem on the worksheet.

---

📝 How to Complete the Entire Worksheet

Just go through each row and apply the trick:

1. Take the number.
2. Add 10.
3. Subtract 1.
4. Write the answer.

---

🎯 Bonus Tip:

If you're doing this with a student, practice recognizing patterns:
- When you add 9, the tens digit increases by 1, and the ones digit decreases by 1 (if possible).
- Example: 43 + 9 → 4 becomes 5 (tens), 3 becomes 2 (ones) → 52
- But 98 + 9 → 9 becomes 10 (carry over), so 98 + 9 = 107

But again, add 10, subtract 1 is the safest method.

---

✔ Final Answer Format (Example):

Let’s do one full column:

```
20 + 9 = 29
17 + 9 = 26
60 + 9 = 69
64 + 9 = 73
61 + 9 = 70
57 + 9 = 66
76 + 9 = 85
69 + 9 = 78
42 + 9 = 51
38 + 9 = 47
22 + 9 = 31
18 + 9 = 27
59 + 9 = 68
37 + 9 = 46
12 + 9 = 21
26 + 9 = 35
35 + 9 = 44
100 + 9 = 109
93 + 9 = 102
75 + 9 = 84
48 + 9 = 57
77 + 9 = 86
66 + 9 = 75
56 + 9 = 65
7 + 9 = 16
```

And so on...

---

💡 Summary

To solve all problems on this worksheet:
- Use the trick: Add 10, then subtract 1
- It’s fast, reliable, and builds number sense
- Practice helps with speed and accuracy

---

Would you like me to generate the complete solution for all the problems listed in your worksheet? If so, please confirm that the list of problems matches what’s in the image, or copy-paste the full list here, and I’ll solve them all!