Problem Description:
The task is to solve a series of addition problems. The worksheet contains 20 equations, and the goal is to compute the sum for each equation.
Solution:
#### Step-by-Step Calculations:
1.
25 + 8 = 33
- Add the units: \( 5 + 8 = 13 \) (write down 3 and carry over 1).
- Add the tens: \( 2 + 1 = 3 \).
- Result: \( 33 \).
2.
11 + 9 = 20
- Add the units: \( 1 + 9 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 1 + 1 = 2 \).
- Result: \( 20 \).
3.
30 + 10 = 40
- Add the tens: \( 3 + 1 = 4 \).
- Units are both 0.
- Result: \( 40 \).
4.
10 + 5 = 15
- Add the units: \( 0 + 5 = 5 \).
- Tens remain 1.
- Result: \( 15 \).
5.
20 + 6 = 26
- Add the units: \( 0 + 6 = 6 \).
- Tens remain 2.
- Result: \( 26 \).
6.
32 + 8 = 40
- Add the units: \( 2 + 8 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 3 + 1 = 4 \).
- Result: \( 40 \).
7.
20 + 8 = 28
- Add the units: \( 0 + 8 = 8 \).
- Tens remain 2.
- Result: \( 28 \).
8.
13 + 7 = 20
- Add the units: \( 3 + 7 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 1 + 1 = 2 \).
- Result: \( 20 \).
9.
22 + 2 = 24
- Add the units: \( 2 + 2 = 4 \).
- Tens remain 2.
- Result: \( 24 \).
10.
35 + 5 = 40
- Add the units: \( 5 + 5 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 3 + 1 = 4 \).
- Result: \( 40 \).
11.
26 + 4 = 30
- Add the units: \( 6 + 4 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 2 + 1 = 3 \).
- Result: \( 30 \).
12.
20 + 2 = 22
- Add the units: \( 0 + 2 = 2 \).
- Tens remain 2.
- Result: \( 22 \).
13.
30 + 3 = 33
- Add the units: \( 0 + 3 = 3 \).
- Tens remain 3.
- Result: \( 33 \).
14.
24 + 6 = 30
- Add the units: \( 4 + 6 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 2 + 1 = 3 \).
- Result: \( 30 \).
15.
21 + 10 = 31
- Add the units: \( 1 + 0 = 1 \).
- Add the tens: \( 2 + 1 = 3 \).
- Result: \( 31 \).
16.
13 + 7 = 20
- Add the units: \( 3 + 7 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 1 + 1 = 2 \).
- Result: \( 20 \).
17.
21 + 9 = 30
- Add the units: \( 1 + 9 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 2 + 1 = 3 \).
- Result: \( 30 \).
18.
30 + 10 = 40
- Add the tens: \( 3 + 1 = 4 \).
- Units are both 0.
- Result: \( 40 \).
19.
10 + 8 = 18
- Add the units: \( 0 + 8 = 8 \).
- Tens remain 1.
- Result: \( 18 \).
20.
15 + 5 = 20
- Add the units: \( 5 + 5 = 10 \) (write down 0 and carry over 1).
- Add the tens: \( 1 + 1 = 2 \).
- Result: \( 20 \).
Final Answers:
\[
\boxed{
\begin{array}{ll}
1. 33 & 11. 30 \\
2. 20 & 12. 22 \\
3. 40 & 13. 33 \\
4. 15 & 14. 30 \\
5. 26 & 15. 31 \\
6. 40 & 16. 20 \\
7. 28 & 17. 30 \\
8. 20 & 18. 40 \\
9. 24 & 19. 18 \\
10. 40 & 20. 20 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of mathematics 1 worksheet.
