# The Common Core Math Standards have been adopted as a set of guidelines for the teaching, learning, and understanding of mathematics in the United States.

In the third grade, students usually learn about basic geometric shapes and ideas like points, lines, line segments, angles, and planes. They might also learn about symmetry, similarity, and simple changes like translation, rotation, and reflection.

Some specific things that students in the third grade might learn about are:

• Identifying and naming common two-dimensional and three-dimensional shapes, such as circles, squares, triangles, rectangles, hexagons, and ovals (e.g., spheres, cones, cylinders, and cubes).
• Understanding and using words like “vertex,” “edge,” “face,” and “corner” to describe the parts of three-dimensional shapes.
• Figuring out how to measure and compare two-dimensional shapes’ sides, angles, and perimeters.
• Putting shapes into groups based on things like how many sides they have and whether or not they are symmetrical.
• Using words like “above,” “below,” “next to,” and “in front of” to describe where things are in space.
• Using shapes and colors to make and describe geometric patterns.
• Find lines of symmetry in two-dimensional shapes and draw them.

It’s important to remember that a third-grade geometry curriculum can cover different topics depending on the school district and the curriculum used.

CCSS.MATH.CONTENT.3.GA.A.1| Reason with shapes and their attributes.

Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.

Standards: 3.G.A.1:

CCSS.MATH.CONTENT.3.G.A.2 | Reason with shapes and their attributes.

Partition shapes into parts with equal areas. Express the area of each part as a unit fraction of the whole.

Standards: 3.G.A.2