Lesson objective: Use ratio tables to organize values and practice scaling the values up or down to calculate percent.

Students practice calculating percent using values in a ratio table. Ratio tables are used here because a ratio table can support scaling the ratio values up or down to determine a factor or multiple of 100. This work develops students' understanding that percent is a special ratio comparing one number with 100.

Students engage in Mathematical Practice #7: Students look for and make use of structure as they interpret percent as a rate per 100 and examine the relationship among values.

**Key vocabulary:**

- ratio table
- scaling up
- scaling down

**Special materials needed:**

- graph paper