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Cardinality and Conservation of Quantity

Early Years · Math · Open Global Math

9 lessons

Goal

Understand that the last number counted tells the total quantity and that spatial rearrangement does not change count.

9 lessons
0 of 9 done
  1. The Last Number Tells How ManyUp next
  2. Answering How Many for Sets Up to 10Not started yet
  3. Spreading Things Out Doesnt Change the CountNot started yet
  4. Moving Things Around Doesnt Change the CountNot started yet
  5. Counting the Same Group in Different DirectionsNot started yet
  6. Each Number is One More Than BeforeNot started yet
  7. Matching Sets with Equal Quantities Regardless of AppearanceNot started yet
  8. Big Things Can Be Fewer Than Small ThingsYou are here
  9. Counting Challenges: How Many Are There?Not started yet
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Learning standards covered

GlobalOGM.0.CC.3Open Global Math Standards 2026™ · Pre-K

Demonstrate understanding of the cardinality principle by answering 'how many?' with the last number name counted for a collection of up to 10 items, recognizing that the arrangement of objects does not change the quantity.