The least number to be multiplied with 9 to make it a perfect cube is _______________.

Answer

To find the least number that needs to be multiplied with 9 to make it a perfect cube, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the given number**: The number we have is 9.

2. **Prime factorization of 9**:
- The prime factorization of 9 is \( 3^2 \) (since \( 9 = 3 \times 3 \)).

3. **Understanding perfect cubes**:
- A number is a perfect cube if all the exponents in its prime factorization are multiples of 3.
- For example, \( 27 = 3^3 \) is a perfect cube, but \( 9 = 3^2 \) is not.

4. **Determine the required exponent**:
- The exponent of 3 in the factorization of 9 is 2.
- To make it a perfect cube, we need the exponent to be a multiple of 3. The nearest multiple of 3 greater than 2 is 3.

5. **Calculate the difference**:
- To go from \( 2 \) to \( 3 \), we need to add \( 1 \) to the exponent of 3.
- This means we need one more factor of 3.

6. **Find the least number to multiply**:
- Therefore, the least number that needs to be multiplied with 9 is \( 3^1 = 3 \).

7. **Final result**:
- When we multiply \( 9 \) by \( 3 \), we get \( 27 \), which is \( 3^3 \) and thus a perfect cube.

### Conclusion:
The least number to be multiplied with 9 to make it a perfect cube is **3**.

---