P2 3D Shapes: Spot Them in the Toy Box

An open toy box sits in a sky-blue toy room. Five toys peek out of it: a dice, a tissue box, a party hat, a tin can and a ball. Under the box, five name cards wait in a jumbled row. "Let's spot the shapes! Which toy is which shape?"

That is Shape Spotter, a 30-second Primary 2 episode of our Topic Explainers series. It is made for your child to watch, with short, simple sentences on screen and no voice-over. Watch it together first, then read on.

Shape Spotter: spot the shapes all around you!

The video moves in three steps. First, each toy is matched to its shape: the dice is a cube, the tissue box a cuboid, the party hat a cone, the tin can a cylinder and the ball a sphere. Next, four of the toys are sorted into two trays, "Rolls" and "Does not roll". Last, each shape gets one plain fact.

In Primary 2, the MOE syllabus asks children to identify, name, describe and classify exactly these five 3D shapes. In Primary 1 your child worked with flat shapes such as squares and circles. Now the shapes can be picked up, turned over and rolled across the floor.

The method

The skill the video builds is to look at what a shape has, then name it. Three things are worth looking at.

1. The flat faces. A face is a flat surface you could press against the table. Ask, "What shape are the flat faces?"

A cube has square faces, all the same size.
A cuboid has rectangle faces, like a box.
A cone has one round flat face, at the bottom.
A cylinder has two round flat faces, one at each end.
A sphere has no flat face at all.

2. A curved surface. Run a hand over the shape. Does any part curve round? A cone, a cylinder and a sphere all have a curved surface. A cube and a cuboid do not: every surface is flat.

3. A point. Only one of the five comes to a point: the cone.

Then sort. Once your child can see these features, sorting follows. Shapes with a curved surface can roll. Shapes with only flat faces cannot; they slide, or they stay where they are put.

This is also the moment to keep flat and solid shape names apart. A ball is a sphere, not a circle. A dice is a cube, not a square. The flat names from Primary 1 describe the faces; the new names describe the whole shape.

Worked examples

All three examples follow the video, with the same five toys.

Worked example 1: which toy is which shape?

Match each toy to its shape: dice, tissue box, party hat, tin can, ball.

The dice. Every face is flat and every face is a square of the same size. It is a cube.

The tissue box. Every face is flat, but the faces are rectangles, long and short. It is a cuboid.

The party hat. It has a round flat face at the bottom, a curved surface, and it comes to a point at the top. It is a cone.

The tin can. It has a round flat face at the top and at the bottom, with a curved side in between. It is a cylinder.

The ball. It is round all over, with no flat face anywhere. It is a sphere.

Every toy has a shape.

Worked example 2: which shapes can roll?

Sort the ball, the dice, the tin can and the tissue box into "Rolls" and "Does not roll".

Step 1: Look for a curved surface. The ball curves all over. The tin can has a curved side. The dice and the tissue box have only flat faces.

Step 2: Sort. The ball and the tin can go into Rolls. The dice and the tissue box go into Does not roll.

"Spheres and cylinders roll. Cubes and cuboids do not."

Notice that the tin can is lying on its side in the video. A cylinder rolls on its curved side, but stand it up on one of its round flat faces and it stays put. That is worth trying at home. The party hat is left out of this sort, because a cone does something in between: it rolls round in a circle. It makes a good question to explore with your child rather than a right-or-wrong answer.

Worked example 3: what does each shape have?

Say one true thing about each shape.

These are the five facts from the video:

"A cube has square faces."
"A cuboid has rectangle faces."
"A cone has a round flat face and a point."
"A cylinder has round flat faces and a curved side."
"A sphere is round all over and has no flat face."

Ask your child to say each fact while holding the matching object. Holding the toy and saying the words together is what makes the name stick.

Try one at home

Which shape is each of these: an orange, a shoebox, a roll of kitchen paper, a traffic cone, a sugar cube?

The orange is a sphere, the shoebox a cuboid, the roll of kitchen paper a cylinder, the traffic cone a cone and the sugar cube a cube. Ask, "How do you know?" each time. A good answer names a face, a curved surface or a point.

Common mistakes

Using flat shape names for solid shapes. Children often call a ball a "circle", a dice a "square" or a party hat a "triangle". Gently correct with both words: "The ball is a sphere. If we trace round it, we get a circle."
Mixing up a cube and a cuboid. Both are box shapes with flat faces. Ask, "Are all the faces squares of the same size?" If yes, it is a cube. If some faces are long rectangles, it is a cuboid.
Thinking a shape changes when it is turned. A cylinder standing up and a cylinder lying down are both cylinders. A cone upside down is still a cone. Turn the objects around often.
Saying a cylinder cannot stand. It rolls on its curved side, but it stands on a flat face. Let your child test both.
Calling a cone a cylinder. Both have a round flat face and a curved surface. Look for the point: only the cone has one.
Guessing from colour or size. A tiny marble and a big beach ball are both spheres. Look at the faces, not the colour or size.

Parent tips

Open your own toy box. Tip out building blocks, balls and toy containers, and sort them together by shape. Then sort them again by "Rolls" and "Does not roll".
Go on a kitchen hunt. Tins, cereal boxes, oranges, ice-cream cones and stock cubes are all here. Ask your child to bring you "something that is a cylinder" or "something with no flat face".
Roll it to test it. Make a small ramp from a tray or a book. Let your child predict whether each object will roll, then try it. Ask why the box only slides.
Trace a face. Press a face of a block or a tin onto paper and draw round it. A cube's face gives a square; a tin's end gives a circle. This joins the flat shapes your child already knows to the new solid ones.
Use the words. Say "face", "flat", "curved" and "point" when you talk about objects. Children borrow the words they hear, and those are the words that let them explain why.

If your child would like a refresher on flat shapes first, our post on P1 shapes: name them, then build a house covers squares, rectangles, triangles, circles and their halves and quarters.

Calm practice, one shape at a time

Shapes settle in by handling real objects and talking about them, a little at a time. That is how we built Singapore Math Drills. Practice is calm by design: no guilt-tripping over a missed day and no dark patterns, and your child's progress is only ever measured against their own.

Our free sample has real practice questions for every Primary level, with no login and no download. Spot the shapes all around you!

Try a sample

Try a free interactive Primary 2 worksheet and see how calm practice feels, with no signup or credit card required.

Try a free Singapore math sample