One shape, many names: 3rd grade math lesson

What this lesson shows

Fixes a mistake

A square is also a rectangle and a rhombus. A kite is still a quadrilateral.

The worked example

The lesson works this one step by step: a square, a kite. Then your kid tries one like it on paper.

The steps

A square is a parallelogram
And a rectangle
And a rhombus
A kite is still a quadrilateral

Helping at home

Check each name’s rule one at a time: 2 pairs of parallel sides, 4 square corners, 4 equal sides. Write every name whose rule the shape meets. Any shape with 4 straight sides and 4 corners is a quadrilateral.

If your kid gets stuck

Check each name’s rule, one at a time.

Watch it with Lux

With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.

See how Lux works

Standards

Common Core 3.G.A.1
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.
Common Core 4.G.A.2
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Matches a standard in all 50 states and DCSee each state's code

Alabama MA19.3.26a, MA19.4.28a
Alaska 3.G.1, 4.G.2
Arizona 3.G.A.1, 4.G.A.2
Arkansas 3.GM.1, 3.GM.3, 4.GM.5
California 3.G.A.1, 4.G.A.2
Colorado 3.G.A.1, 4.G.A.2
Connecticut 3.G.A.1, 4.G.A.2
Delaware 3.G.A.1, 4.G.A.2
District of Columbia 3.G.A.1, 4.G.A.2
Florida MA.3.GR.1.2
Georgia 3.GSR.6.2, 4.GSR.8.2
Hawaii 3.G.A.1, 4.G.A.2
Idaho 3.G.A.1, 4.G.A.2
Illinois 3.G.A.1, 4.G.A.2
Indiana 4.G.1, 3.G.1, 5.G.1, 4.G.3
Iowa 3.G.A.1, 4.G.A.2
Kansas 3.G.1, 4.G.2
Kentucky KY.3.G.1.b, KY.3.G.1.c, KY.4.G.2
Louisiana 3.G.A.1, 4.G.A.2
Maine 3.G.A.1, 4.G.A.2
Maryland 3.GR.B.5, 4.GR.C.9, 5.GR.B.3.a
Massachusetts 3.G.A.1, 4.G.A.2
Michigan 3.G.A.1, 4.G.A.2
Minnesota 4.3.1.2, 4.3.1.1
Mississippi 3.G.1, 4.G.2
Missouri 3.GM.A.1, 3.GM.A.2, 4.GM.A.2
Montana MT.3.G.1, MT.4.G.2, 4.D1.23, 5.D1.4
Nebraska 3.G.1.1, 4.G.1.c
Nevada 3.G.A.1, 4.G.A.2
New Hampshire 3.G.A.1, 4.G.A.2
New Jersey 3.G.A.1, 4.G.A.2
New Mexico 3.G.A.1, 4.G.A.2
New York NY-3.G.1, NY-4.G.2.b, NY-4.G.2.c, NY-4.G.2.a
North Carolina NC.3.G.1.a, NC.3.G.1.b, NC.4.G.2
North Dakota 3.GM.G.2, 4.GM.G.2
Ohio 3.G.1, 4.G.2, 5.G.3
Oklahoma 4.GM.1.2
Oregon 3.GM.A.1, 4.GM.A.2
Pennsylvania CC.2.3.3.A.1, CC.2.3.4.A.2
Rhode Island 3.G.A.1, 4.G.A.2
South Carolina 4.MGSR.3.1
South Dakota 3.G.A.1, 4.G.A.2
Tennessee 3.G.A.1, 4.G.A.2
Texas 111.5.b.6.A, 111.5.b.6.B, 111.6.b.6.C, 111.6.b.6.D
Utah 3.G.1, 4.G.2
Vermont 3.G.A.1, 4.G.A.2
Virginia 4.MG.5a, 4.MG.5d.i, 4.MG.5d.ii, 4.MG.5d.iii, 4.MG.5d.iv, 4.MG.5c, 4.MG.5e, 5.MG.3b
Washington 3.G.A.1, 4.G.A.2
West Virginia M.3.26, M.4.27
Wisconsin M.3.G.A.1, M.4.G.A.2
Wyoming 3.G.1, 4.G.2

One shape, many names