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Early learning · Grades K–2

Shapes, attributes and sorting explanations

Sort by a clear feature such as number of sides or curved boundary.

Make a worksheet

Understand the idea

Name the property

Sort by a clear feature such as number of sides or curved boundary.

Turning does not rename

Rotating a shape does not change its defining properties.

More than one rule may work

Explain the rule you chose.

Worked examples

Which plane shape has three straight sides?

A triangle has three sides.

triangle

How many corners does a square have?

A square has four vertices.

4

Try it yourself

  1. Which shape has no straight sides?

    1. circle
    2. square
    3. rectangle
    4. triangle

  2. A square is turned so one corner points upward. Is it still a square? Explain.

  3. Which pair can be grouped as four-sided shapes?

    1. circle and oval
    2. square and rectangle
    3. triangle and circle
    4. circle and triangle

  4. Two triangles have how many sides in total when counted separately?

Answers and marking notes

Answers and marking notes
  1. circle

    A circle has a curved boundary.

  2. Yes. It still has four equal sides and four right angles.

    Turning changes orientation, not the defining properties.

  3. square and rectangle

    Both have four straight sides.

  4. 6

    3 + 3 = 6.

Preview material · independent educational review required. Grade bands are approximate, not official curriculum alignment.