Wyoming Math 2.G.3b

Math2nd GradeGeometry

The Standard

Partition circles and rectangles into two, three, or four equal shares by: Describing the whole as two halves, three thirds, four fourths.

2023 Wyoming Mathematics Content and Performance Standards · Reason with shapes and their attributes.

Teacher's field guide

What Students Need to Do: Students split circles and rectangles into two, three, or four equal parts. They name each part and explain how the parts make one whole.
What Mastery Looks Like: Students can draw equal parts in either shape and label each part correctly. They can say, for example, that three thirds make one whole.
Common Misconceptions: Students may count the pieces without checking whether they are equal. They may think a fourth is bigger than a third because four is bigger than three.
How to Assess It: Give students a circle and a rectangle. Ask them to split the circle into fourths and the rectangle into thirds, label each piece, and write how many pieces make each whole.

Lesson moves

Have students fold paper rectangles into thirds and paper circles into fourths, then label each piece and rebuild each whole.
Show two rectangles with three strips each, one equal and one uneven; ask, "Which shows thirds? How do you know?"
Hand out shape cards with equal and unequal parts; partners sort them into halves, thirds, fourths, or not equal.
Use a paper pizza and a rectangular brownie tray; draw equal servings for four friends and name each person's share.

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