Grade 2

Learning Outcome: 2N2 Students investigate addition and subtraction within 100.

Use What You Know is a guided learning activity designed with intentional architecture to help students recognize and use relationships between calculations. Beginning with one shared addition example, students explore related expressions, predict how the answers will change, and explain their reasoning.

Key Learning Objectives:

• Notice Relationships: Identify what changes and what stays the same between expressions.

• Use Known Results: Use a known sum to determine related answers.

• Connect Addition and Subtraction: Explain how an addition fact can help solve a related subtraction expression.

• Explain Mathematical Thinking: Describe relationships using words, sketches, or annotations.

Activity Highlights:

• Student Choice: Students choose which related expression to explore and explain.

• Reasoning Before Calculating: Prompts encourage students to predict using relationships before checking their answers.

• Responsive Discussion: Teachers collect and connect student explanations, inviting students to reconsider their predictions when needed.

• Adaptable Examples: Make a copy in Google Slides to change the numbers for your students.