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Common Core · Grade 1 · Geometry

Standard 1.G.A.1

Free lessons and printable worksheets aligned to Common Core math standard 1.G.A.1.

4 lessons3 worksheets

Lessons for 1.G.A.1

Defining and non-defining attributes of shapesThree straight sides make a triangle, but its color, size and which way it turns do not.Lesson

Naming circles, triangles, squares and rectanglesTelling everyday flat shapes apart and calling each one by name.Lesson

Two-dimensional shapesNaming and sorting flat shapes by their sides and corners.Lesson

Sides, corners and sorting shapesGrouping flat shapes by number of sides, number of corners, or whether the sides are equal.Lesson

Printable Worksheets

Defining and non-defining attributes of shapes worksheet (PDF)Printable worksheet with answer keyPreview

Naming circles, triangles, squares and rectangles worksheet (PDF)Printable worksheet with answer keyPreview

Sides, corners and sorting shapes worksheet (PDF)Printable worksheet with answer keyPreview