# Looks for and expresses regularity in repeated reasoning by J7G2UPN

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Domain             Geometry
Cluster            Reason with shapes and their attributes
Standard(s)        2.G.3. Partition circles and rectangles into two, three, or four equal shares, describe the
shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two
halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not
have the same shape.
Materials          SF, paper, pencil
cookie into fourths in two different ways. Explain how you know that each cookie has been
partitioned into fourths.

Continuum of Understanding
Developing            Incorrectly partitioned one or more cookies into 4 equal          Possible Solutions
Understanding          pieces.
 Explanation did not include an understanding that each
cookie needed to be partitioned into 4 pieces.
 Explanation did not include an understanding that each
fractional part needs to be the same size.
Complete              Correctly partitioned each cookie into fourths in a different
Understanding          way.
 Explanation includes an understanding that there needs to be
four pieces and that each fractional piece needs to be the
same size.

Standards for Mathematical Practice
1.   Makes sense and perseveres in solving problems.
2.   Reasons abstractly and quantitatively.
3.   Constructs viable arguments and critiques the reasoning of others.
4.   Models with mathematics.
5.   Uses appropriate tools strategically.
6.   Attends to precision.
7.   Looks for and makes use of structure.
8.   Looks for and expresses regularity in repeated reasoning.

NC DEPARTMENT OF PUBLIC INSTRUCTION                                                                 SECOND GRADE

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