Math · Stage 1

2D shape detectives: sides, corners and curves

Name 2D shapes by counting their sides and corners and telling straight from curved (semicircle, quarter circle, parallelogram, pentagon, hexagon, octagon).

✦ Math📘 Stage 1 · S1⏱ ~9 min🧒 Ages 5–6★ Free to start

name 2D shapes by counting their sides and corners and telling straight from curved (semicircle, quarter circle, parallelogram, pentagon, hexagon, octagon)

Start the free lesson →⬇ Printable PDF

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Mei and the cracker tray

Mei helps at the market stall. Her tray holds round crackers, square crackers and one half-moon cracker. Her little brother asks, 'Which cracker has the most corners?' Mei does not know how to tell. She looks at the edges and the sharp points. Some edges are flat and some bend. By the end I can count sides and corners, tell straight from curved, and name shapes.

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What your child will learn

1Sides and corners of a book

2Edges that bend and edges that do not

3Count sides and corners

4Fold a circle in half and in half again

5Compare circle, triangle and semicircle

6Match names to pictures

7Polygons and their names

8Sketch it and turn it

9The parallelogram

10Words with pictures

11Shape hunt at home

12Misconception clinic

13Check your thinking

14Can-do self-check

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A peek inside

A roti canai is folded into a triangle. How many sides and corners does it have?

Trace each side in a colour: 1, 2, 3.<br>Dot each corner where two sides meet: 1, 2, 3.<br>The counts match because each corner sits between two sides.<br>So the roti has 3 sides and 3 corners.

Try this at home: A roti canai is folded into a triangle. How many sides and corners does it have?

Ready to play and learn?

Start the free interactive lesson, or print the handout for screen-free play.

Start the free lesson →⬇ Download PDF

Part of Math · Stage 1 · S1 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.