What does the Flat or Solid? — 2D and 3D Shapes for Kindergarten activity teach?

Flat or Solid? — 2D and 3D Shapes for Kindergarten is a free interactive activity for Kindergarten, focused on Geometry. Children play it right in the browser — no printing, login, or setup required.

Is Flat or Solid? — 2D and 3D Shapes for Kindergarten free to use?

Yes. Flat or Solid? — 2D and 3D Shapes for Kindergarten is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.

Which ages is this activity for?

It is designed for Kindergarten (Geometry) and works well for whole-class, small-group, or independent practice.

Flat or Solid? — 2D and 3D Shapes for Kindergarten

Look at each shape and tap whether it is flat (2D) or solid (3D). Aligned to Common Core K.G.A.3 — identify shapes as two-dimensional or three-dimensional.

Kindergarten·Geometry·K.G.A.3

Look at each shape and tap whether it is flat (2D) or solid (3D). Aligned to Common Core K.G.A.3 — identify shapes as two-dimensional or three-dimensional.

About this activity

This free, interactive shape activity helps young children notice, name, and compare the shapes around them. It plays right in the browser on tablets, phones, and classroom computers, with nothing to install and no account needed.

It is aligned to Common Core K.G.A.3 in the Geometry strand. Children explore at their own pace with gentle, immediate feedback — no timer, no score, just playful practice.

What's inside this activity

Designed for Grade K learners (ages about 5 to 9)
Common Core strand: Geometry
Aligned to Common Core standard K.G.A.3

How to play

Children look at the shapes on the screen and read or listen to the prompt.

They tap the shape that matches, or sort shapes into the right group.

A warm check confirms a correct choice and offers an easy retry when needed.

What your child practices

Recognising and naming everyday two- and three-dimensional shapes
Noticing how many sides and corners a shape has
Telling flat shapes apart from solid ones
Describing and comparing shapes in their own words

Learning goals

Name and describe common shapes with growing confidence.

Tell two-dimensional (flat) shapes apart from three-dimensional (solid) ones — the focus of Common Core K.G.A.3.

Build the spatial vocabulary that later geometry and measurement work rely on.

Frequently asked questions

What does the Flat or Solid? — 2D and 3D Shapes for Kindergarten activity teach?: Flat or Solid? — 2D and 3D Shapes for Kindergarten is a free interactive activity for Kindergarten, focused on Geometry. Children play it right in the browser — no printing, login, or setup required.
Is Flat or Solid? — 2D and 3D Shapes for Kindergarten free to use?: Yes. Flat or Solid? — 2D and 3D Shapes for Kindergarten is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.
Which ages is this activity for?: It is designed for Kindergarten (Geometry) and works well for whole-class, small-group, or independent practice.

Practice this standard

See all K.G.A.3 activities