standard_description: Use the structure of an expression to identify ways to rewrite it. For example, see x^(4) – y^(4 )as (x^(2))^(2 )– (y^(2))^(2), thus recognizing it as a difference of squares that can be factored as (x^(2 )– y^(2))(x^(2 )+ y^(2)).
problem_activity: Stage 1: Add
Required Preparation
Materials to Gather
Connecting cubes
Counters
Materials to Copy
Blackline Masters
5-Frame
Number Mat 1–5
5-frames Stages 1 and 2 Recording Sheet

Narrative
Students begin with a full 5-frame and roll to see how many counters to add.


aligns: no