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3rd grade · Math · Unit 12 of 18

Sorting Polygons

Triangles, quadrilaterals, pentagons, hexagons and octagons, regular and irregular.

What your child practices

Practices naming polygons by their number of sides and sorting them as regular (all sides and angles equal) or irregular.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 3.6(B) · using attributes to recognize and sort polygons and quadrilaterals

How we explain it

Children can open this short lesson before they practice.

  1. A polygon is a closed shape with straight sides.
  2. Triangle 3 sides, quadrilateral 4, pentagon 5, hexagon 6, octagon 8.
  3. A polygon has as many corners as sides.

Example: How many sides does a hexagon have? Hexa- means 6. A hexagon has 6 sides. Answer: 6

Sorting Polygons in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 12 of 18 in 3rd grade Math, after Area & Perimeter and before 3D Objects.

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

    An irregular polygon has…

    • sides or angles that are not all equal
    • no sides
    • only equal sides

  2. Question 2

    How many corners does a hexagon have?

    • 5
    • 6
    • 8

  3. Question 3

    How many sides does a triangle have?

    • 4
    • 3
    • 5

  4. Question 4

    How many sides does a hexagon have?

    • 8
    • 5
    • 6

  5. Question 5

    A square is a type of…

    • pentagon
    • triangle
    • quadrilateral

  6. Question 6

    Which statement is true?

    • Every square is a quadrilateral
    • Every quadrilateral is a square
    • A circle is a polygon

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