Wyoming Math 1.G.3b

Math1st GradeGeometry

The Standard

Partition circles and rectangles into two and four equal shares and: Describe the whole as two of, or four of the shares.

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 or four equal shares. They describe the whole as two or four of those shares.
What Mastery Looks Like: A student can fold or draw lines to make equal shares in either shape. They can point to the shares and say how many make the whole.
Common Misconceptions: Students may count any two or four pieces as equal shares, even when one is larger. Some think a rectangle must be split with vertical lines, so they reject equal horizontal strips or a four-part grid.
How to Assess It: On a sheet with one circle and one rectangle, ask students to split the circle into two equal shares and the rectangle into four equal shares, then write how many shares make each whole.

Lesson moves

Fold paper circles and rectangles into two or four equal shares, then unfold and count how many shares make each whole.
Show a rectangle split into four equal strips beside one split into an equal four-part grid, and ask, 'How can both show four equal shares?'
Sort cards showing split circles and rectangles into equal and unequal shares, then name the number of shares in each equal example.
Draw a round pizza and a rectangular brownie, split each for four children, and label the equal shares that make each whole.

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