Lesson 16
Finding the Percentage
Lesson Narrative
While students have found percentages with easy numbers before now, in this lesson they will develop a general structure (MP7) that will work for any numbers.
Learning Goals
Teacher Facing
- Critique or justify (orally) statements about percentages and equivalent numerical expressions.
- Generalize a process for finding the percentage that C is of B and justify (orally) why this can be abstracted as $\frac{C}{B} \boldcdot 100$.
Student Facing
Let’s find percentages in general.
Learning Targets
Student Facing
- I can solve different problems like “60 is what percentage of 40?” by dividing and multiplying.
CCSS Standards
Addressing
Glossary Entries
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percent
The word percent means “for each 100.” The symbol for percent is %.
For example, a quarter is worth 25 cents, and a dollar is worth 100 cents. We can say that a quarter is worth 25% of a dollar.
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percentage
A percentage is a rate per 100.
For example, a fish tank can hold 36 liters. Right now there is 27 liters of water in the tank. The percentage of the tank that is full is 75%.
