In Module 4, students extend their arithmetic work to include using letters to represent numbers. Students understand that letters are simply "stand-ins" for numbers and that arithmetic is carried out exactly as it is with numbers. Students explore operations in terms of verbal expressions and determine that arithmetic properties hold true with expressions because nothing has changedšthey are still doing arithmetic with numbers. Students determine that letters are used to represent specific but unknown numbers and are used to make statements or identities that are true for all numbers or a range of numbers. Students understand the importance of specifying units when defining letters.
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The module begins with work related to the Pythagorean theorem and right triangles. Before the lessons of this module are presented to students, it is important that the lessons in Modules 2 and 3 related to the Pythagorean theorem are taught (i.e., Module 2 Lessons 15 and 16 and Module 3 Lessons 13 and 14). In Modules 2 and 3, students used the Pythagorean theorem to determine the unknown side length of a right triangle. The solutions from those modules are revisited and are the motivation for learning about square roots and irrational numbers in general.
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Using the Virginia Museum of Fine Arts website, students explore the sculptural work of 20th Century Conceptual artist Sol LeWitt to expand their understanding of geometric concepts, creatively play with mathematical ideas, and be inspired to make art of their own.

The website page provides a scaffolded approach to exploring Sol LeWitt's sculpture titled "1, 2, 3, 4, 5, 6." culminating in a challenge for students to build a 3-D Tinkercad model of a geometry concept of their own choosing.

Passwords are essential to protecting our private information from others. Use this lesson to explore some basic probabilty behind password options and how easily they can be guessed! This lesson provides an intro into cybersecurity and its vocabulary, as well as incorporates low prep activities you can modifiy to fit your needs.

This video is part of the Continue to Know with WHRO TV series. Watch Ashley Ehret teach about exponents.

This video is part of the Continue to Know with WHRO TV series. Watch Ashley Ehret teach about perfect squares.

Investigating positive exponents and perfect squares  Mathematics Instructional Plans (MIPs) help teachers align instruction with the Mathematics Standards of Learning (SOL) by providing examples of how the knowledge, skills and processes found in the SOL and curriculum framework can be presented to students in the classroom.