Subscribe

3rd grade · Math · Unit 9 of 12

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.

Minnesota K-12 Academic Standards benchmark: 3.2.4.1 · naming polygons by their number of sides

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 Minnesota

In the Minnesota K-12 Academic Standards, this is unit 9 of 12 in 3rd grade Math, after Round & Count 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: Minnesota Department of Education (MDE)

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

    Which shape is NOT a polygon?

    • A triangle
    • A circle
    • A pentagon

  2. Question 2

    How many sides does a quadrilateral have?

    • 3
    • 4
    • 5

  3. Question 3

    A regular polygon has…

    • only one side
    • no angles
    • all sides and all angles equal

  4. Question 4

    A rhombus has four…

    • right angles only
    • equal sides
    • curved sides

  5. Question 5

    How many sides does a triangle have?

    • 5
    • 4
    • 3

  6. Question 6

    Which statement is true?

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

More 3rd grade