standard_description: Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
problem_activity: Stage 1: Groups of Objects
Required Preparation
Materials to Gather
Collections of objects
Connecting cubes
Materials to Copy
Blackline Masters
Less, Same, More Mat

Narrative
Students choose a collection of objects and place the objects in the box at the top of the mat. They complete the mat to show groups that have fewer, the same, or more objects than the original amount.
Additional Information
Give at least 2 collections of between 2 and 9 objects per group of 2.


aligns: no