3D Shapes Introduction — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A round ball will roll across the floor.
A sphere has no flat faces, so it rolls smoothly in any direction.
2. A cube has flat sides, so it will slide.
Flat square faces let a cube slide along the floor instead of rolling.
3. A cone can roll in a circle path.
A cone has a round bottom and a tip, so it rolls around in a circle path.
4. A soup can rolls only on its round side.
A cylinder rolls on its curved side but stops when it lands on a flat end.
5. Group all cubes in one pile.
Sorting same shapes into one pile helps us see how many cubes we have.
6. A basketball goes in the sphere pile.
A basketball is a sphere, so it joins all other round sphere items.
7. A book on a flat side will slide.
A book is a flat prism, so it slides smoothly across a flat table.
8. A marble and an orange both roll.
A marble and an orange are spheres, so they both roll easily anywhere.
9. Sort these shapes by how they move.
We can group 3D shapes by how they move, like roll, slide, or both.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Sphere
→ Rolls every way
Rolls every way
Cube
→ Slides on flat sides
Slides on flat sides
Cone
→ Rolls in a circle
Rolls in a circle
Cylinder
→ Rolls and slides
Rolls and slides
Each 3D shape moves a special way based on its flat or curved sides.