Math worksheet for practicing addition of large numbers, featuring 12 problems and a playful octopus design.

Problem: Addition of Big Numbers

The task involves solving 12 addition problems involving large numbers. Below is the step-by-step solution for each problem.

---

#### 1)
$$
94189 + 677047
$$
- Align the numbers by their place values:
$$
\begin{array}{r}
94189 \\
+ 677047 \\
\hline
\end{array}
$$
- Add column by column from right to left:
- Units: \(9 + 7 = 16\) → Write down 6, carry over 1.
- Tens: \(8 + 4 + 1 = 13\) → Write down 3, carry over 1.
- Hundreds: \(1 + 0 + 1 = 2\) → Write down 2.
- Thousands: \(4 + 7 = 11\) → Write down 1, carry over 1.
- Ten-thousands: \(9 + 6 + 1 = 16\) → Write down 6, carry over 1.
- Hundred-thousands: \(0 + 1 = 1\) → Write down 1.

Result:
$$
\boxed{771236}
$$

---

#### 2)
$$
429401 + 316915
$$
- Align the numbers:
$$
\begin{array}{r}
429401 \\
+ 316915 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(1 + 5 = 6\).
- Tens: \(0 + 1 = 1\).
- Hundreds: \(4 + 9 = 13\) → Write down 3, carry over 1.
- Thousands: \(9 + 6 + 1 = 16\) → Write down 6, carry over 1.
- Ten-thousands: \(2 + 1 + 1 = 4\).
- Hundred-thousands: \(4 + 3 = 7\).

Result:
$$
\boxed{746316}
$$

---

#### 3)
$$
180774 + 690192
$$
- Align the numbers:
$$
\begin{array}{r}
180774 \\
+ 690192 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(4 + 2 = 6\).
- Tens: \(7 + 9 = 16\) → Write down 6, carry over 1.
- Hundreds: \(7 + 1 + 1 = 9\).
- Thousands: \(0 + 0 = 0\).
- Ten-thousands: \(8 + 9 = 17\) → Write down 7, carry over 1.
- Hundred-thousands: \(1 + 6 + 1 = 8\).

Result:
$$
\boxed{870966}
$$

---

#### 4)
$$
714342 + 616772
$$
- Align the numbers:
$$
\begin{array}{r}
714342 \\
+ 616772 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(2 + 2 = 4\).
- Tens: \(4 + 7 = 11\) → Write down 1, carry over 1.
- Hundreds: \(3 + 7 + 1 = 11\) → Write down 1, carry over 1.
- Thousands: \(4 + 6 + 1 = 11\) → Write down 1, carry over 1.
- Ten-thousands: \(1 + 1 + 1 = 3\).
- Hundred-thousands: \(7 + 6 = 13\) → Write down 3, carry over 1.

Result:
$$
\boxed{1331114}
$$

---

#### 5)
$$
692268 + 132614
$$
- Align the numbers:
$$
\begin{array}{r}
692268 \\
+ 132614 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(8 + 4 = 12\) → Write down 2, carry over 1.
- Tens: \(6 + 1 + 1 = 8\).
- Hundreds: \(2 + 6 = 8\).
- Thousands: \(2 + 2 = 4\).
- Ten-thousands: \(9 + 3 = 12\) → Write down 2, carry over 1.
- Hundred-thousands: \(6 + 1 + 1 = 8\).

Result:
$$
\boxed{824882}
$$

---

#### 6)
$$
239949 + 29950
$$
- Align the numbers:
$$
\begin{array}{r}
239949 \\
+ 029950 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(9 + 0 = 9\).
- Tens: \(4 + 5 = 9\).
- Hundreds: \(9 + 9 = 18\) → Write down 8, carry over 1.
- Thousands: \(9 + 9 + 1 = 19\) → Write down 9, carry over 1.
- Ten-thousands: \(3 + 2 + 1 = 6\).
- Hundred-thousands: \(2 + 0 = 2\).

Result:
$$
\boxed{269899}
$$

---

#### 7)
$$
101021 + 404969
$$
- Align the numbers:
$$
\begin{array}{r}
101021 \\
+ 404969 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(1 + 9 = 10\) → Write down 0, carry over 1.
- Tens: \(2 + 6 + 1 = 9\).
- Hundreds: \(0 + 9 = 9\).
- Thousands: \(1 + 4 = 5\).
- Ten-thousands: \(0 + 0 = 0\).
- Hundred-thousands: \(1 + 4 = 5\).

Result:
$$
\boxed{506990}
$$

---

#### 8)
$$
945960 + 426835
$$
- Align the numbers:
$$
\begin{array}{r}
945960 \\
+ 426835 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(0 + 5 = 5\).
- Tens: \(6 + 3 = 9\).
- Hundreds: \(9 + 8 = 17\) → Write down 7, carry over 1.
- Thousands: \(5 + 6 + 1 = 12\) → Write down 2, carry over 1.
- Ten-thousands: \(4 + 2 + 1 = 7\).
- Hundred-thousands: \(9 + 4 = 13\) → Write down 3, carry over 1.

Result:
$$
\boxed{1372795}
$$

---

#### 9)
$$
560603 + 302506
$$
- Align the numbers:
$$
\begin{array}{r}
560603 \\
+ 302506 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(3 + 6 = 9\).
- Tens: \(0 + 0 = 0\).
- Hundreds: \(6 + 5 = 11\) → Write down 1, carry over 1.
- Thousands: \(0 + 2 + 1 = 3\).
- Ten-thousands: \(6 + 0 = 6\).
- Hundred-thousands: \(5 + 3 = 8\).

Result:
$$
\boxed{863109}
$$

---

#### 10)
$$
932550 + 150427
$$
- Align the numbers:
$$
\begin{array}{r}
932550 \\
+ 0150427 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(0 + 7 = 7\).
- Tens: \(5 + 2 = 7\).
- Hundreds: \(5 + 4 = 9\).
- Thousands: \(2 + 0 = 2\).
- Ten-thousands: \(3 + 5 = 8\).
- Hundred-thousands: \(9 + 1 = 10\) → Write down 0, carry over 1.

Result:
$$
\boxed{1082977}
$$

---

#### 11)
$$
430349 + 980703
$$
- Align the numbers:
$$
\begin{array}{r}
430349 \\
+ 980703 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(9 + 3 = 12\) → Write down 2, carry over 1.
- Tens: \(4 + 0 + 1 = 5\).
- Hundreds: \(3 + 7 = 10\) → Write down 0, carry over 1.
- Thousands: \(0 + 0 + 1 = 1\).
- Ten-thousands: \(3 + 8 = 11\) → Write down 1, carry over 1.
- Hundred-thousands: \(4 + 9 + 1 = 14\) → Write down 4, carry over 1.

Result:
$$
\boxed{1411052}
$$

---

#### 12)
$$
807210 + 723372
$$
- Align the numbers:
$$
\begin{array}{r}
807210 \\
+ 723372 \\
\hline
\end{array}
$$
- Add column by column:
- Units: \(0 + 2 = 2\).
- Tens: \(1 + 7 = 8\).
- Hundreds: \(2 + 3 = 5\).
- Thousands: \(7 + 3 = 10\) → Write down 0, carry over 1.
- Ten-thousands: \(0 + 2 + 1 = 3\).
- Hundred-thousands: \(8 + 7 = 15\) → Write down 5, carry over 1.

Result:
$$
\boxed{1530582}
$$

---

Final Answers:

$$
\boxed{
\begin{array}{lll}
1) & 771236 & 2) & 746316 & 3) & 870966 \\
4) & 1331114 & 5) & 824882 & 6) & 269899 \\
7) & 506990 & 8) & 1372795 & 9) & 863109 \\
10) & 1082977 & 11) & 1411052 & 12) & 1530582 \\
\end{array}
}
$$