The task involves solving 3-digit addition problems using the regrouping strategy. Let's solve each problem step by step.
Problem 1:
\[
\begin{array}{r}
265 \\
+ 126 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
5 + 6 = 11
\]
Write down 1 and carry over 1 to the tens place.
2.
Tens Place: Add the tens digits plus the carry-over.
\[
6 + 2 + 1 = 9
\]
Write down 9.
3.
Hundreds Place: Add the hundreds digits.
\[
2 + 1 = 3
\]
Write down 3.
#### Final Answer:
\[
\boxed{391}
\]
---
Problem 2:
\[
\begin{array}{r}
627 \\
+ 254 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
7 + 4 = 11
\]
Write down 1 and carry over 1 to the tens place.
2.
Tens Place: Add the tens digits plus the carry-over.
\[
2 + 5 + 1 = 8
\]
Write down 8.
3.
Hundreds Place: Add the hundreds digits.
\[
6 + 2 = 8
\]
Write down 8.
#### Final Answer:
\[
\boxed{881}
\]
---
Problem 3:
\[
\begin{array}{r}
782 \\
+ 282 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
2 + 2 = 4
\]
Write down 4.
2.
Tens Place: Add the tens digits.
\[
8 + 8 = 16
\]
Write down 6 and carry over 1 to the hundreds place.
3.
Hundreds Place: Add the hundreds digits plus the carry-over.
\[
7 + 2 + 1 = 10
\]
Write down 0 and carry over 1 to the thousands place.
#### Final Answer:
\[
\boxed{1064}
\]
---
Problem 4:
\[
\begin{array}{r}
329 \\
+ 246 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
9 + 6 = 15
\]
Write down 5 and carry over 1 to the tens place.
2.
Tens Place: Add the tens digits plus the carry-over.
\[
2 + 4 + 1 = 7
\]
Write down 7.
3.
Hundreds Place: Add the hundreds digits.
\[
3 + 2 = 5
\]
Write down 5.
#### Final Answer:
\[
\boxed{575}
\]
---
Problem 5:
\[
\begin{array}{r}
417 \\
+ 125 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
7 + 5 = 12
\]
Write down 2 and carry over 1 to the tens place.
2.
Tens Place: Add the tens digits plus the carry-over.
\[
1 + 2 + 1 = 4
\]
Write down 4.
3.
Hundreds Place: Add the hundreds digits.
\[
4 + 1 = 5
\]
Write down 5.
#### Final Answer:
\[
\boxed{542}
\]
---
Problem 6:
\[
\begin{array}{r}
502 \\
+ 208 \\
\hline
\end{array}
\]
#### Step-by-Step Solution:
1.
Ones Place: Add the ones digits.
\[
2 + 8 = 10
\]
Write down 0 and carry over 1 to the tens place.
2.
Tens Place: Add the tens digits plus the carry-over.
\[
0 + 0 + 1 = 1
\]
Write down 1.
3.
Hundreds Place: Add the hundreds digits.
\[
5 + 2 = 7
\]
Write down 7.
#### Final Answer:
\[
\boxed{710}
\]
---
Final Answers:
\[
\boxed{391, 881, 1064, 575, 542, 710}
\]
Parent Tip: Review the logic above to help your child master the concept of three digit addition with regrouping worksheet.
