The given expression is \( 5 \sqrt[3]{81} \). This represents five times the cube root of 81.

### Step-by-Step Solution:

1. **Understand the Expression**: 
   \[
   5 \times \sqrt[3]{81}
   \]
   The cube root of 81 is the number that, when multiplied by itself three times, gives 81.

2. **Find the Cube Root**:
   \[
   \sqrt[3]{81} \approx 4.326
   \]
   Since 81 is not a perfect cube, the cube root will be an irrational number.

3. **Multiply by 5**:
   \[
   5 \times 4.326 \approx 21.63
   \]

### Final Answer:
\[
5 \sqrt[3]{81} \approx 21.63
\]

Would you like a detailed breakdown or have any further questions?

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**Related Questions:**

1. What is \( 5 \times \sqrt[3]{125} \)?
2. How do you calculate \( \sqrt[3]{100} \) approximately?
3. What is the value of \( \sqrt[4]{81} \)?
4. How would you evaluate \( 3 \times \sqrt[3]{64} \)?
5. What is \( 5 \times \sqrt[3]{27} \)?

**Tip**: Remember that cube roots are used to find a number which, when multiplied by itself three times, results in the original number.

Learn how to calculate 5 times the cube root of 81 with a detailed step-by-step solution. This problem covers cube roots and basic arithmetic operations. Suitable for students in Grades 6-8.

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