Grade 1 - Math Worksheets (Horizontal Addition) - Free Printable

The image you've uploaded is a math worksheet titled "ADDING BY 1", which contains a series of simple addition problems where each problem involves adding the number 1 to another number (ranging from 0 to 10). The goal is to solve all these problems and practice basic addition.

Let me walk through how to solve this worksheet and provide the correct answers.

---

🔢 Understanding the Task

Each row contains several equations like:
- `0 + 1 = ?`
- `4 + 1 = ?`
- `7 + 1 = ?`

All of these follow the pattern: a number + 1, so the answer is simply the number that comes immediately after the given number in counting.

For example:
- `5 + 1 = 6` because 6 comes right after 5.
- `9 + 1 = 10` because 10 comes after 9.

This is a foundational skill for early learners.

---

✔ Solving the Worksheet

Here are the solutions for all the problems:

#### First Row:
```
0+1=1 4+1=5 7+1=8 5+1=6 8+1=9
```

#### Second Row:
```
7+1=8 2+1=3 5+1=6 4+1=5 1+1=2
```

#### Third Row:
```
3+1=4 4+1=5 9+1=10 6+1=7 6+1=7
```

#### Fourth Row:
```
6+1=7 7+1=8 5+1=6 3+1=4 2+1=3
```

#### Fifth Row:
```
7+1=8 5+1=6 2+1=3 8+1=9 0+1=1
```

#### Sixth Row:
```
5+1=6 8+1=9 7+1=8 3+1=4 2+1=3
```

#### Seventh Row:
```
7+1=8 5+1=6 10+1=11 2+1=3 6+1=7
```

#### Eighth Row:
```
8+1=9 6+1=7 1+1=2 4+1=5 8+1=9
```

#### Ninth Row:
```
3+1=4 6+1=7 1+1=2 10+1=11 10+1=11
```

#### Tenth Row:
```
10+1=11 2+1=3 5+1=6 4+1=5 3+1=4
```

#### Eleventh Row:
```
8+1=9 9+1=10 5+1=6 1+1=2 4+1=5
```

#### Twelfth Row:
```
4+1=5 0+1=1 7+1=8 9+1=10 1+1=2
```

#### Thirteenth Row:
```
8+1=9 8+1=9 10+1=11 4+1=5 2+1=3
```

#### Fourteenth Row:
```
2+1=3 9+1=10 8+1=9 10+1=11 4+1=5
```

#### Fifteenth Row:
```
10+1=11 8+1=9 7+1=8 1+1=2 0+1=1
```

#### Sixteenth Row:
```
4+1=5 1+1=2 7+1=8 4+1=5 5+1=6
```

#### Seventeenth Row:
```
4+1=5 8+1=9 5+1=6 2+1=3 1+1=2
```

#### Eighteenth Row:
```
0+1=1 8+1=9 4+1=5 7+1=8 8+1=9
```

---

✔ Final Answer Summary

All problems involve adding 1, so:
- Any number `n + 1 = n+1`
- Special case: `10 + 1 = 11`

There are 100 problems on this sheet. Since every problem follows the same rule, the solution is straightforward.

---

🎯 How to Use This Worksheet

- Students can fill in the blanks.
- Teachers or parents can check answers using the key above.
- It helps build fluency in basic addition and number sense.

---

✔ Conclusion

This worksheet reinforces counting forward by one, a crucial step in learning arithmetic. All answers are just the next number in the sequence.

If you'd like, I can generate a printable version of the completed worksheet with answers filled in. Let me know!