PK.GM.2.2
PK.GM.2.2 Directly compare two objects with a common measurable attribute using ageappropriate vocabulary (e.g. longer/shorter, heavier/lighter, taller/shorter).
In a Nutshell
This objective indicates that students shouldbe able to compare two objects and use mathspecific vocabulary to describe the relationship between one of their measurable commonalities (e.g., length, height, weight, etc.) by indicating if one is longer or shorter, taller or shorter, heavier or lighter than the other.
Student Actions

Teacher Actions


Build a flexible conceptual understanding by exploring and dabbling in the comparison of a variety of objects using length, size, or weight.

Communicate mathematically by using ageappropriate, mathspecific vocabulary about comparison while at play and in conversations with peers or teachers.


Establish math goals by introducing desired vocabulary words and encouraging the use of these words as students explore their environment.

Connect mathematical representations by modeling the comparison of two objects using comparative (er) adjectives. (e.g., larger/smaller, shorter/taller, etc.)

Build procedural fluency by providing multiple opportunities for students to compare a variety of objects using learned vocabulary in both structured and play settings. While students must be able to directly compare two objects, it will deepen understanding if a variety of objects are interchanged, allowing them to make connections between sets.

Facilitate meaningful math dialogue by encouraging students to explain their thinking and justify their answers.

Key Understandings

Misconceptions


Assigning meaning to comparison adjectives (vocabulary).

Flexibility of thought; realizing that the largest/tallest/heaviest of two objects compared may not remain the largest when compared to a different object. (i.e., a counting bear is larger than a gummy bear, but when the counting bear is compared to a teddy bear, it is no longer the largest/tallest/heaviest.)


Confusing the meanings of the vocabulary.

Overgeneralizing or grouping measurable attributes (e.g., a pillow might be the largest of a set of objects, but is not necessarily the heaviest. Size doesnâ€™t always equal weight.)

Knowledge Connections

Prior Knowledge

Leads to



Sort twodimensional objects using characteristics (K.GM.1.2)

Use words to compare objects according to length, size, and weight (K.GM.2.1)

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