MathScience6-8
Negative Rates and Ratios in Science, Grade 7
By Jen O.
A practice set of roughly a few pages that teaches 7th graders to compute and interpret unit rates with negative values, such as temperature drops per hour, using worked examples in a science context. It builds skills in setting up ratios, dividing rational numbers, and explaining what the sign of a rate means for direction of change.
Customize for your classroom
Teacher Guide & Tips
- Use this as a warm-up or a 45-minute guided lesson after students are comfortable dividing integers and fractions, working through the worked example together before independent practice.
- Discussion question: Why does a negative rate tell us something different from a positive one, and how would the answer change if the temperature rose instead of fell?
- Scaffold for struggling readers: Have them underline the units in each problem and write a short sentence stating whether the quantity is increasing or decreasing before they calculate.
- Extension for advanced students: Ask them to create their own scenario with a negative rate in another context, such as depth change or account balances, and justify the sign of the answer.
- Estimated time: About 20 to 30 minutes for the worked example and first problems, with additional time for the remaining practice items.
MathScience6-8
Negative Rates and Ratios in Science, Grade 7
By Jen O.
A practice set of roughly a few pages that teaches 7th graders to compute and interpret unit rates with negative values, such as temperature drops per hour, using worked examples in a science context. It builds skills in setting up ratios, dividing rational numbers, and explaining what the sign of a rate means for direction of change.
Customize for your classroom
Teacher Guide & Tips
- Use this as a warm-up or a 45-minute guided lesson after students are comfortable dividing integers and fractions, working through the worked example together before independent practice.
- Discussion question: Why does a negative rate tell us something different from a positive one, and how would the answer change if the temperature rose instead of fell?
- Scaffold for struggling readers: Have them underline the units in each problem and write a short sentence stating whether the quantity is increasing or decreasing before they calculate.
- Extension for advanced students: Ask them to create their own scenario with a negative rate in another context, such as depth change or account balances, and justify the sign of the answer.
- Estimated time: About 20 to 30 minutes for the worked example and first problems, with additional time for the remaining practice items.