Need to Knows in a K-2 Class

The “Need to Know” videos were created in partnership with Avondale Elementary School District.

 

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Subitizing and Comparison

 

 

 

 

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Rote Counting, One-to-One Correspondence, & Cardinality

 

 

 

 

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Hierarchical Inclusion, Number Conservation, & Unitizing

 

 

 

 

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Extending the Number Sense Trajectory to Build Place Value Understanding

 

 

 

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Misconceptions in Geometry

 

 

 

 

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Progression of a Number Line

 

 

 

 

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Properties of Addition

 

 

 

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Fractions in the Early Grades

 

 

 

 

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Base Ten Models for Operations (Addition and Subtraction)

 

 

 

 

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Regrouping with Subtraction