Lesson objective: Understand that an object may have multiple attributes that are measurable.

Students bring prior knowledge of attributes from K.G.A.1. This prior knowledge is extended to objects and their multiple attributes as students describe how objects are similar and how they are different. A conceptual challenge students may encounter is that a single object can have many attributes which can be compared between objects.

The concept is developed through work with looking at and describing objects and their attributes, which will faciliate learning that attributes can be similar or different from object to object.

This work helps students deepen their understanding of equivalence because understanding similarities and differences and being able to describe those around us is the basic foundation for equivalence (and non equivalence).

Students engage in Mathematical Practice 3 (Students will use mathematical language to justify their conclusions) as they describe similarities and differences among objects and correctly identify attributes that objects share.

**Key vocabulary:**

- attribute
- difference
- height
- length
- similarity

**Special materials needed:**

- students' shoes