standard_description: Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
problem_activity: Sort these shapes (cut out from
Polygons Template
) into groups. You may sort them any way you want and into as many groups as you want. Be prepared to explain how you sorted the shapes.
Sort them another way.


aligns: no