In the associated Algebra 1 lesson, students examine different ways to express repeated percentage increase. Here, they have an opportunity to do similar math with numbers that are easier to work with mentally. By understanding how the meaning of exponents and the property can be used to rewrite numerical expressions, students will be able to use structure that they notice here in the work in the Algebra 1 lesson. In the activity “Rewriting Expressions,” students practice using the property to rewrite expressions. This practice will put them in a better position to explain why expressions are equal and to write equivalent expressions in the associated Algebra 1 lesson. When students notice that they can rewrite an expression by substituting an equal expression or using a property, they are noticing and making use of structure (MP7).