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To determine how much active ingredient is in a 45-gram tube of 2% hydrocortisone cream, we calculate 2% of 45 grams.

### Step-by-Step Solution
1. **Convert the percentage to a decimal**:  
   \( 2\% = \frac{2}{100} = 0.02 \)

2. **Multiply the total weight by the percentage**:  
   \( 45 \text{ grams} \times 0.02 = 0.9 \text{ grams} \)

### Answer
The correct answer is:
- **0.9 grams**

Would you like a more detailed explanation or have additional questions?

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Here are 5 related questions to deepen understanding:

1. How would you calculate the amount of active ingredient in a 30-gram tube with a 1% concentration?
2. What does a 2% concentration mean in terms of grams per 100 grams?
3. How would you express 0.9 grams as milligrams?
4. If a tube contained 3% hydrocortisone cream, how much active ingredient would be in a 50-gram tube?
5. How is percentage concentration typically used in other pharmaceutical products?

**Tip:** When calculating percentage concentrations, converting the percentage to a decimal (e.g., 2% to 0.02) helps simplify the calculation.

A 45-gram tube of 2% hydrocortisone cream contains how much active ingredient?

Learn how to calculate the amount of active ingredient in a 45-gram tube of 2% hydrocortisone cream. This problem uses basic percentage calculations to determine the amount of active component in pharmaceutical products, suitable for Grades 6-8.

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