Addition worksheets: Add 2-digit numbers in columns (with - Free Printable

The task is to solve the 2-digit addition problems provided in the worksheet. Below are the solutions for each problem, along with a step-by-step explanation.

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Problem 1:

$$
20 + 10 = \ ?
$$
- Add the ones place: \( 0 + 0 = 0 \)
- Add the tens place: \( 2 + 1 = 3 \)
- Result: \( 30 \)

Answer: \( 30 \)

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Problem 2:

$$
19 + 21 = \ ?
$$
- Add the ones place: \( 9 + 1 = 10 \) (write down 0 and carry over 1)
- Add the tens place: \( 1 + 2 + 1 (\text{carry}) = 4 \)
- Result: \( 40 \)

Answer: \( 40 \)

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Problem 3:

$$
11 + 15 = \ ?
$$
- Add the ones place: \( 1 + 5 = 6 \)
- Add the tens place: \( 1 + 1 = 2 \)
- Result: \( 26 \)

Answer: \( 26 \)

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Problem 4:

$$
15 + 12 = \ ?
$$
- Add the ones place: \( 5 + 2 = 7 \)
- Add the tens place: \( 1 + 1 = 2 \)
- Result: \( 27 \)

Answer: \( 27 \)

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Problem 5:

$$
18 + 13 = \ ?
$$
- Add the ones place: \( 8 + 3 = 11 \) (write down 1 and carry over 1)
- Add the tens place: \( 1 + 1 + 1 (\text{carry}) = 3 \)
- Result: \( 31 \)

Answer: \( 31 \)

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Problem 6:

$$
35 + 25 = \ ?
$$
- Add the ones place: \( 5 + 5 = 10 \) (write down 0 and carry over 1)
- Add the tens place: \( 3 + 2 + 1 (\text{carry}) = 6 \)
- Result: \( 60 \)

Answer: \( 60 \)

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Problem 7:

$$
14 + 24 = \ ?
$$
- Add the ones place: \( 4 + 4 = 8 \)
- Add the tens place: \( 1 + 2 = 3 \)
- Result: \( 38 \)

Answer: \( 38 \)

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Problem 8:

$$
33 + 62 = \ ?
$$
- Add the ones place: \( 3 + 2 = 5 \)
- Add the tens place: \( 3 + 6 = 9 \)
- Result: \( 95 \)

Answer: \( 95 \)

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Problem 9:

$$
37 + 26 = \ ?
$$
- Add the ones place: \( 7 + 6 = 13 \) (write down 3 and carry over 1)
- Add the tens place: \( 3 + 2 + 1 (\text{carry}) = 6 \)
- Result: \( 63 \)

Answer: \( 63 \)

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Problem 10:

$$
23 + 46 = \ ?
$$
- Add the ones place: \( 3 + 6 = 9 \)
- Add the tens place: \( 2 + 4 = 6 \)
- Result: \( 69 \)

Answer: \( 69 \)

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Problem 11:

$$
55 + 30 = \ ?
$$
- Add the ones place: \( 5 + 0 = 5 \)
- Add the tens place: \( 5 + 3 = 8 \)
- Result: \( 85 \)

Answer: \( 85 \)

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Problem 12:

$$
16 + 43 = \ ?
$$
- Add the ones place: \( 6 + 3 = 9 \)
- Add the tens place: \( 1 + 4 = 5 \)
- Result: \( 59 \)

Answer: \( 59 \)

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Final Answers:

$$
\boxed{
\begin{array}{ll}
1. & 30 \\
2. & 40 \\
3. & 26 \\
4. & 27 \\
5. & 31 \\
6. & 60 \\
7. & 38 \\
8. & 95 \\
9. & 63 \\
10. & 69 \\
11. & 85 \\
12. & 59 \\
\end{array}
}
$$