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3rd grade · Math · Unit 13 of 18

3D Objects

Faces, edges and vertices

What your child practices

Naming 3D objects, counting their faces, edges and vertices, and thinking about how they are built from flat faces or from straws and clay.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 3.6(A) · classifying cones, cylinders, spheres, prisms and cubes by their attributes

How we explain it

Children can open this short lesson before they practice.

  1. A face is a flat side.
  2. An edge is where two faces meet.
  3. A vertex is a corner.

Example: How many faces does a cube have? A cube is shaped like a die. A die has 6 flat faces. Answer: 6

3D Objects in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 13 of 18 in 3rd grade Math, after Sorting Polygons and before Time.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Texas Education Agency (TEA)

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A candle is shaped most like a…

    🕯️
    • cylinder
    • cone
    • rectangular prism
    • sphere

  2. Question 2

    What shape are the slanted faces of a pyramid?

    • hexagon
    • triangle
    • circle
    • square

  3. Question 3

    Which 3D object can be stacked but can't roll?

    • cylinder
    • cone
    • sphere
    • cube

  4. Question 4

    How many edges does a cube have?

    answer box

  5. Question 5

    How many vertices (corners) does a cube have?

    • 12
    • 8
    • 9
    • 6

  6. Question 6

    How many flat faces does a cylinder have?

    answer box

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