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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.

Maine Learning Results learning standard: 3.G.A.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 Maine

In the Maine Learning Results, 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: Maine Department of Education

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?

    • 3
    • 5
    • 4

  2. Question 2

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

    • a pentagon
    • regular
    • irregular

  3. Question 3

    Sort: a polygon with 4 sides is a…

    • triangle
    • hexagon
    • quadrilateral

  4. Question 4

    A rhombus has four…

    • right angles only
    • equal sides
    • curved sides

  5. Question 5

    A polygon is a closed shape with…

    • straight sides
    • only curved sides
    • no sides

  6. Question 6

    A shape has 7 sides. It is a…

    • octagon
    • heptagon
    • hexagon

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