# GR. PK Unit: Lesson Seed: CARDINALITY & CONSERVATION

**Essential Questions: **

• What do numbers convey? (identify amount--Cardinal; name position --ordinal; indicated location --nominal)

• How can numbers be expressed, ordered, and compared?

• What are different ways to count? ( count all, count one, count back, skip count, count groups)

• What are efficient ways to count? (count up, (or back) from largest number, count sets of items, count to/using landmark numbers)

• How can numbers be decomposed into other numbers or composed into another number?

### Lesson Plans and Seeds

**LESSON SEED:** COUNTING TO FIND OUT "HOW MANY"

**LESSON SEED:**ARRANGE & COMPARE SETS USING ONE-TO-ONE CORRESPONDENCE

**LESSON SEED:**CONSERVATION

**LESSON SEED:**CARDINALITY & CONSERVATION

**LESSON SEED:**ONE MORE

**LESSON SEED:**BUILDING SETS

**LESSON SEED:**MATCHING SETS OF OBJECTS TO NUMERALS

**LESSON SEED:**NUMBER OF THE DAY

**LESSON SEED:**SUBITIZING

**Download Seeds, Plans, and Resources (zip)**

**Unit Overview**

**Content Emphasis By Clusters in Grade pk**

**Progressions from Common Core State Standards in Mathematics**

**Send Feedback to MSDE’s Mathematics Team**

Lesson seeds are ideas that can be used to build a lesson aligned to the CCSS. Lesson seeds are not meant to be all-inclusive, nor are they substitutes for instruction. When developing lessons from these seeds, teachers must consider the needs of all learners. It is also important to build checkpoints into the lessons where appropriate formative assessment will inform a teachers instructional pacing and delivery.

**Standard(s):**

PK.4.CC.B.4b Recognize that the last number name said tells the number of objects counted.

**Purpose/Big Idea:**

Cardinality and conservation of number – Recognize that the last number name said tells the number of objects counted and that the quantity stays the same even if the arrangement changes.
**This activity can be used as a pre-assessment; however, students need many opportunities to explore this concept.**

**Materials:**

- Bear counters
- Circle Work

##### Activity:

**Exploration**

**Teacher's Note: **

##### Guiding Questions:

“How many bears are in this set?”