15 minutes is what portion of an hour? $$ \frac{15}{60}=\frac{1}{4}=0.25 $$ $$ \frac{15}{100}=\frac{3}{20}=0.15 $$

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You're on the right track! Let's clarify the calculation to determine what portion 15 minutes is of one hour.

### Understanding the Basics
- **Total Minutes in an Hour:** There are **60 minutes** in **1 hour**.

### Calculating the Portion
To find out what portion 15 minutes is of an hour, you set up the fraction:

$$
\frac{15 \text{ minutes}}{60 \text{ minutes}} 
$$

Simplifying this fraction:

$$
\frac{15}{60} = \frac{1}{4} = 0.25
$$

### Interpretation
- **Fraction Form:** $$ \frac{1}{4} $$
- **Decimal Form:** $$ 0.25 $$
- **Percentage Form:** $$ 25\% $$

So, **15 minutes is one-quarter (25%) of an hour**.

### Addressing the Second Calculation
You also mentioned:

$$
\frac{15}{100} = \frac{3}{20} = 0.15
$$

This calculation represents **15 minutes out of 100 minutes**, which isn't directly applicable when measuring portions of an hour. Since an hour consists of 60 minutes, the appropriate denominator for this context is **60**, not **100**.

### Summary
- **15 minutes** is **$$ \frac{1}{4} $$** or **25%** of **1 hour**.
- The calculation using **100** as the denominator is not relevant when the total is **60 minutes**.

Feel free to ask if you have any more questions!
15 minutes is one-quarter (25%) of an hour.

15 minutes is what
portion of an hour?

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