Fractions are a way of representing a part of a whole or a quantity that is not a whole number. Fractions are written as a ratio of two numbers, with the number on the top (numerator) representing the part of the whole, and the number on the bottom (denominator) representing the total number of equal parts in the whole.


Tier 1Tier 1

Core, universal instructional practices.


tier 2Tier 2

Supplemental interventions that work similarly for all students receiving them.


tier 3Tier 3 and Special Education

Intensive interventions that are increasingly tailored to each student's individual needs. Special Education is "Tier 3 on steroids."

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