Students can practice their addition strategies with this engaging rock-and-roll themed math sheet.

Problem Description:

The task is to solve a series of 2-digit addition problems with regrouping. The worksheet is titled "Rock Star Addition," and it contains 15 addition problems. Each problem involves adding three 2-digit numbers.

Solution Approach:

To solve each addition problem, we will:
1. Add the three numbers step by step.
2. Perform regrouping (carrying over) whenever necessary.
3. Write down the final sum for each problem.

Let's solve each problem one by one.

---

Problem 1:

\[
27 + 40 + 13
\]
- Add the ones place: \(7 + 0 + 3 = 10\). Write down 0 and carry over 1.
- Add the tens place: \(2 + 4 + 1 + 1 = 8\).
- Final sum: 80

---

Problem 2:

\[
22 + 40 + 18
\]
- Add the ones place: \(2 + 0 + 8 = 10\). Write down 0 and carry over 1.
- Add the tens place: \(2 + 4 + 1 + 1 = 8\).
- Final sum: 80

---

Problem 3:

\[
11 + 19 + 42
\]
- Add the ones place: \(1 + 9 + 2 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(1 + 1 + 4 + 1 = 7\).
- Final sum: 72

---

Problem 4:

\[
55 + 28 + 13
\]
- Add the ones place: \(5 + 8 + 3 = 16\). Write down 6 and carry over 1.
- Add the tens place: \(5 + 2 + 1 + 1 = 9\).
- Final sum: 96

---

Problem 5:

\[
62 + 15 + 18
\]
- Add the ones place: \(2 + 5 + 8 = 15\). Write down 5 and carry over 1.
- Add the tens place: \(6 + 1 + 1 + 1 = 9\).
- Final sum: 95

---

Problem 6:

\[
48 + 13 + 11
\]
- Add the ones place: \(8 + 3 + 1 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(4 + 1 + 1 + 1 = 7\).
- Final sum: 72

---

Problem 7:

\[
16 + 26 + 10
\]
- Add the ones place: \(6 + 6 + 0 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(1 + 2 + 1 + 1 = 5\).
- Final sum: 52

---

Problem 8:

\[
70 + 19 + 12
\]
- Add the ones place: \(0 + 9 + 2 = 11\). Write down 1 and carry over 1.
- Add the tens place: \(7 + 1 + 1 + 1 = 10\).
- Final sum: 101

---

Problem 9:

\[
45 + 33 + 18
\]
- Add the ones place: \(5 + 3 + 8 = 16\). Write down 6 and carry over 1.
- Add the tens place: \(4 + 3 + 1 + 1 = 9\).
- Final sum: 96

---

Problem 10:

\[
13 + 65 + 14
\]
- Add the ones place: \(3 + 5 + 4 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(1 + 6 + 1 + 1 = 9\).
- Final sum: 92

---

Problem 11:

\[
22 + 45 + 23
\]
- Add the ones place: \(2 + 5 + 3 = 10\). Write down 0 and carry over 1.
- Add the tens place: \(2 + 4 + 2 + 1 = 9\).
- Final sum: 90

---

Problem 12:

\[
46 + 22 + 14
\]
- Add the ones place: \(6 + 2 + 4 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(4 + 2 + 1 + 1 = 8\).
- Final sum: 82

---

Problem 13:

\[
52 + 33 + 17
\]
- Add the ones place: \(2 + 3 + 7 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(5 + 3 + 1 + 1 = 10\).
- Final sum: 102

---

Problem 14:

\[
37 + 40 + 16
\]
- Add the ones place: \(7 + 0 + 6 = 13\). Write down 3 and carry over 1.
- Add the tens place: \(3 + 4 + 1 + 1 = 9\).
- Final sum: 93

---

Problem 15:

\[
29 + 10 + 33
\]
- Add the ones place: \(9 + 0 + 3 = 12\). Write down 2 and carry over 1.
- Add the tens place: \(2 + 1 + 3 + 1 = 7\).
- Final sum: 72

---

Final Answers:

\[
\boxed{80, 80, 72, 96, 95, 72, 52, 101, 96, 92, 90, 82, 102, 93, 72}
\]