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A **unit rate** is a ratio where the second term is one, meaning the denominator is "1" for comparisons such as "per hour" or "per item." Let's analyze each option to identify which are unit rates:

1. **$5 / 2 sandwiches**: This is not a unit rate because it's per 2 sandwiches, not per 1 sandwich.
2. **70 miles / 1 hour**: This is a unit rate because it compares miles per hour (70 miles for 1 hour).
3. **80 words per minute**: This is a unit rate because it compares words per minute (80 words for 1 minute).
4. **18 ounces in 1 serving**: This is a unit rate because it compares ounces per serving (18 ounces for 1 serving).
5. **$1.25 for 5 donuts**: This is not a unit rate because it's per 5 donuts, not per 1 donut.

So, the correct unit rates are:
- **70 miles / 1 hour**
- **80 words per minute**
- **18 ounces in 1 serving**

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you convert a rate to a unit rate?
2. What are examples of unit rates in everyday life?
3. How can you calculate the unit rate from $5 / 2 sandwiches?
4. Why is "$1.25 for 5 donuts" not considered a unit rate?
5. What is the importance of unit rates in comparisons?

**Tip:** To convert any rate to a unit rate, divide the numerator by the denominator so that the second value becomes 1.

Which of the following represent unit rates? Select ALL that apply.

Learn how to identify unit rates from given ratios. Understand what makes a ratio a unit rate and how to determine which ratios apply, such as miles per hour or words per minute. Suitable for students in Grades 5-7.

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