Wyoming Math 2.G.3a
The Standard
Partition circles and rectangles into two, three, or four equal shares by: Describing the shares using the words halves, thirds, half of, a third of, etc.
2023 Wyoming Mathematics Content and Performance Standards · Reason with shapes and their attributes.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students divide circles and rectangles into two, three, or four equal parts. They name each part as a half, third, or fourth of the whole shape.
What Mastery Looks Like
- Students can draw equal parts in both circles and rectangles. They can shade one part, name its share of the whole, and explain how they know the parts are equal.
Common Misconceptions
- Students may draw three lines when asked for thirds and end up with four parts. They may call a piece a third just because there are three pieces, even when the pieces are different sizes.
How to Assess It
- Give students a blank rectangle and circle. Ask them to split the rectangle into three equal parts and the circle into four, then shade and label one part of each.
Lesson moves
Ways to Teach It
Give pairs paper rectangles to fold into thirds and paper circles to fold into fourths, then shade and label one part of each.
Show a rectangle split into three unequal parts and have students write why none of the parts is a third.
Give partners circle and rectangle cards to sort into equal halves, thirds, fourths, or unequal parts.
Draw a rectangular pan of brownies and ask students to mark four equal servings, then label one serving as a fourth of the pan.
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Printable 2.G.3a Worksheet
A ready-to-print activity worksheet aligned to 2.G.3a, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 2.G.3
Partition circles and rectangles into two, three, or four equal shares by:
- 1.G.3b
Describe the whole as two of, or four of the shares.
- 1.G.3a
Describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of.
- 2.G.3b
Describing the whole as two halves, three thirds, four fourths.
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