A number ending in 9 will have the units place of its square as

Options

A. 3
B. 9
C. 1
D. 6

Answer

To determine the unit place of the square of a number that ends in 9, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the number ending in 9**: Let's denote a number that ends in 9 as \( n \). For example, \( n \) could be 9, 19, 29, etc.

2. **Square the number**: We need to find \( n^2 \). The unit place of \( n^2 \) will depend on the unit place of \( n \).

3. **Calculate the square of 9**:
- \( 9^2 = 81 \)
- The unit place of 81 is **1**.

4. **Calculate the square of 19**:
- \( 19^2 = 361 \)
- The unit place of 361 is **1**.

5. **Calculate the square of 29**:
- \( 29^2 = 841 \)
- The unit place of 841 is **1**.

6. **Generalize the pattern**:
- From the calculations above, we see that regardless of the number (as long as it ends in 9), the unit place of its square is always **1**.

### Conclusion:
Therefore, if a number ends in 9, the unit place of its square will always be **1**.

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