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A unit rate is a ratio that compares two quantities, where the second quantity is always 1. Let's examine each option:

1. **$5 / 2 sandwiches**: This is not a unit rate because it doesn't simplify to a ratio with a denominator of 1 (it would be $2.50 per sandwich, which is a unit rate).
2. **70 miles / 1 hour**: This *is* a unit rate because it describes the number of miles traveled in 1 hour.
3. **80 words per minute**: This *is* a unit rate, as it describes the number of words typed or spoken in 1 minute.
4. **18 ounces in 1 serving**: This *is* a unit rate because it describes the number of ounces in 1 serving.
5. **$1.25 for 5 donuts**: This is not a unit rate because it is not per 1 donut (though it could be simplified to $0.25 per donut, which would be a unit rate).

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

Would you like any additional explanations?

Here are 5 questions to expand on this:
1. What is the formula to calculate a unit rate?
2. Can all ratios be simplified into unit rates?
3. How does simplifying $1.25 for 5 donuts result in a unit rate?
4. Why is it important to express rates in unit form?
5. How do you identify the denominator of 1 in a rate?

**Tip:** When working with rates, always check if the ratio can be simplified to have a denominator of 1 to determine if it's a unit rate!

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

Learn how to identify unit rates from given ratios. Understand which options represent unit rates with detailed explanations on how to simplify ratios for students in Grades 6-8.

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