# Algebra 1 – Unit 1 – Expressions

## Standards

 Standard Language A.SSE.1 Interpret expressions that represent a quantity in terms of its context. A.SSE.1.a Interpret parts of an expression, such as terms, factors, and coefficients. A.SSE.2 Use the structure of an expression to identify ways to rewrite it. A.APR.1 Understand that polynomials form a system analogous to the integers, namely they are closed under the operation of addition, subtraction, and multiplication; Add, subtract, multiply polynomials. N.RN.3 Explain why the sum or product of two rational numbers is rational, that the sum of a rational number and an irrational number is irrational; and that the product of a nonzero rational number and an irrational number is irrational.

## The “Story” of This Unit

Numbers tell a story about the world they are placed into. We need a common language to talk about these numbers and symbols. We need to build a common language and understand what basic expectations can be known when a math sentence (expression) is displayed. Expressions and numbers (rational & irrational) interact with one another in specific ways, mathematicians hold specific expectations for how these sets of numbers and symbols interact with one another, and generalizations can be made to simplify how much we need to think about these relationships. While seemingly tricky at first, these numbers and symbols always behave in the same waysâ€¦we need to understand those ways of interacting.

## Resources

### Slides

A1_Unit 1_1920 - Expressions (final)

### Practice Test

A1 U1 Practice Test