standard_description: (+)Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
problem_activity: Stage 2: Subtract within 10
Required Preparation
Materials to Gather
Colored pencils or crayons
Number cards 0–10
Materials to Copy
Blackline Masters
Capture Squares Stage 2 Gameboard

Narrative
Students choose two cards and find the difference.


aligns: no