3D Shapes Introduction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which shape sits flat and will not roll away?
A) Cube
B) Sphere
C) Cone
D) Cylinder
A cube has only flat square faces, so it stays still and never rolls.
2. You stack 3 cubes. How many flat faces touch between the cubes?
A) 1
B) 2
C) 3
D) 4
Three stacked cubes have two places where flat faces touch between them.
3. Which shape is the WORST choice for the bottom of a tower?
A) Cube
B) Block
C) Pyramid
D) Sphere
A sphere rolls in every direction, so it makes a wobbly base for any tower.
4. I add a cone, then a cube, then a sphere. Which is on top?
A) Cone
B) Cube
C) Pyramid
D) Sphere
The sphere was added last, so it sits on top above the cube and cone.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A tower of 5 cubes is taller than a tower of 3 cubes.
Five cubes stacked are taller than three cubes stacked, since more cubes go higher.
2. A cube has 6 flat faces total.
A cube has six flat square faces: top, bottom, and four sides all equal.
3. A pyramid on top of a cube makes a pointy shape tower.
A pyramid has a sharp tip, so it makes the tower pointy at the top.
4. A cylinder can be stacked only on its flat end.
A cylinder stays still only on its flat circle ends, since the curved side rolls.
5. If I stack 2 cubes and 1 pyramid, I have 3 shapes total.
Two cubes plus one pyramid equals three 3D shapes stacked together.