1st Grade Addition Worksheet: Adding Tens

Problem Description:

The image shows a 1st Grade Addition Worksheet focusing on adding tens. The task is to solve the addition problems provided in the worksheet.

Worksheet Problems:

1. \( 10 + 30 = \)
2. \( 20 + 10 = \)
3. \( 30 + 20 = \)
4. \( 40 + 10 = \)
5. \( 50 + 10 = \)
6. \( 60 + 10 = \)
7. \( 30 + 40 = \)
8. \( 30 + 30 = \)
9. \( 50 + 20 = \)
10. \( 40 + 20 = \)
11. \( 50 + 30 = \)
12. \( 60 + 20 = \)
13. \( 60 + 30 = \)
14. \( 40 + 40 = \)

Solution Approach:

Each problem involves adding two numbers that are multiples of 10. To solve these, we simply add the tens digits together and append a zero at the end (since both numbers are multiples of 10).

Step-by-Step Solutions:

1. \( 10 + 30 = 40 \)
- Add the tens: \( 1 + 3 = 4 \)
- Append a zero: \( 40 \)

2. \( 20 + 10 = 30 \)
- Add the tens: \( 2 + 1 = 3 \)
- Append a zero: \( 30 \)

3. \( 30 + 20 = 50 \)
- Add the tens: \( 3 + 2 = 5 \)
- Append a zero: \( 50 \)

4. \( 40 + 10 = 50 \)
- Add the tens: \( 4 + 1 = 5 \)
- Append a zero: \( 50 \)

5. \( 50 + 10 = 60 \)
- Add the tens: \( 5 + 1 = 6 \)
- Append a zero: \( 60 \)

6. \( 60 + 10 = 70 \)
- Add the tens: \( 6 + 1 = 7 \)
- Append a zero: \( 70 \)

7. \( 30 + 40 = 70 \)
- Add the tens: \( 3 + 4 = 7 \)
- Append a zero: \( 70 \)

8. \( 30 + 30 = 60 \)
- Add the tens: \( 3 + 3 = 6 \)
- Append a zero: \( 60 \)

9. \( 50 + 20 = 70 \)
- Add the tens: \( 5 + 2 = 7 \)
- Append a zero: \( 70 \)

10. \( 40 + 20 = 60 \)
- Add the tens: \( 4 + 2 = 6 \)
- Append a zero: \( 60 \)

11. \( 50 + 30 = 80 \)
- Add the tens: \( 5 + 3 = 8 \)
- Append a zero: \( 80 \)

12. \( 60 + 20 = 80 \)
- Add the tens: \( 6 + 2 = 8 \)
- Append a zero: \( 80 \)

13. \( 60 + 30 = 90 \)
- Add the tens: \( 6 + 3 = 9 \)
- Append a zero: \( 90 \)

14. \( 40 + 40 = 80 \)
- Add the tens: \( 4 + 4 = 8 \)
- Append a zero: \( 80 \)

Final Answers:

\[
\boxed{
\begin{array}{ll}
1. & 40 \\
2. & 30 \\
3. & 50 \\
4. & 50 \\
5. & 60 \\
6. & 70 \\
7. & 70 \\
8. & 60 \\
9. & 70 \\
10. & 60 \\
11. & 80 \\
12. & 80 \\
13. & 90 \\
14. & 80 \\
\end{array}
}
\]