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3rd grade · Math · Unit 10 of 14

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.

Alaska content standards learning standard: 3.G.1 · sorting quadrilaterals and other shapes by the attributes they share

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 Alaska

In the Alaska content standards, this is unit 10 of 14 in 3rd grade Math, after Area & Perimeter and before Times Tens.

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: Alaska Department of Education and Early Development

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

    How many sides does a triangle have?

    • 4
    • 5
    • 3

  2. Question 2

    How many sides does a pentagon have?

    • 5
    • 8
    • 6

  3. Question 3

    A triangle with sides 3 cm, 4 cm and 5 cm is…

    • a pentagon
    • irregular
    • regular

  4. Question 4

    A triangle with three equal sides is…

    • a quadrilateral
    • irregular
    • regular

  5. Question 5

    How many sides does a quadrilateral have?

    • 5
    • 4
    • 3

  6. Question 6

    Which statement is true?

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

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