diagrams

This lesson unit is intended to help students to:

• Add and subtract directed numbers (positive, negative and zero) with understanding.
• Address common misconceptions about the addition and subtraction of directed numbers.
• Explain their reasoning using diagrams.

For this project, students will first build and study a functioning, semi-closed ecosystem. They will model this ecosystem using diagrams. They will collect, organize, and interpret data about how the ecosystem changes over time. Lastly, they will develop a testable question, hypothesis, and...