12345679`xx 72` is equal to :

Options

A. 88888888
B. 999999998
C. 888888888
D. 898989898

Answer

To solve the problem of finding the product of \( 12345679 \times 72 \), we can break it down into simpler steps.

### Step-by-Step Solution:

1. **Identify the Numbers**: We have two numbers to multiply: \( 12345679 \) and \( 72 \).

2. **Break Down the Multiplication**: We can express \( 72 \) as \( 70 + 2 \). This allows us to use the distributive property:
\[ 12345679 \times 72 = 12345679 \times (70 + 2) \]

3. **Distribute the Multiplication**:
\[ 12345679 \times 72 = 12345679 \times 70 + 12345679 \times 2 \]

4. **Calculate \( 12345679 \times 70 \)**:
- First, multiply \( 12345679 \) by \( 7 \):
\[ 12345679 \times 7 = 86419753 \]
- Then, add a zero (since we are actually multiplying by \( 70 \)):
\[ 12345679 \times 70 = 864197530 \]

5. **Calculate \( 12345679 \times 2 \)**:
\[ 12345679 \times 2 = 24691358 \]

6. **Add the Two Results Together**:
\[ 864197530 + 24691358 \]

7. **Perform the Addition**:
- Align the numbers:
```
864197530
+ 24691358
----------------
888888888
```

8. **Final Result**:
\[ 12345679 \times 72 = 888888888 \]

### Final Answer:
The product of \( 12345679 \times 72 \) is \( 888888888 \).