3D Shapes Introduction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which 3D shape is best for building a tall, sturdy tower?
A) Cube
B) Sphere
C) Cone
D) Pyramid
Cubes stack neatly because every face is a flat square that sits flat on the next.
2. If you stack 4 cubes, how many cubes are in the tower?
A) 3
B) 4
C) 5
D) 6
Stacking 4 cubes gives a tower of 4, since each block adds one to the count.
3. Which shape will roll off your tower first?
A) Cube
B) Block
C) Sphere
D) Pyramid
A sphere has no flat face, so it rolls off the top of the tower right away.
4. You stack 2 cubes and add 1 pyramid on top. What is on top?
A) Cube
B) Sphere
C) Cylinder
D) Pyramid
The pyramid is the last piece added, so it sits on top of the two cubes.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Cubes stack well because their faces are flat.
Flat square faces meet evenly, so cubes stack into strong towers.
2. A sphere on top of a tower will roll off.
A sphere has no flat side to grip, so it rolls right off the tower top.
3. A pyramid makes a good top for a tower.
A pyramid sits flat on its base and points up, making a fun tower top.
4. If I stack 3 cubes, my tower has 3 cubes.
Three stacked cubes give a tower that contains exactly three cubes.
5. Two cubes side by side cover 2 flat faces on the floor.
Each cube touches the floor with one square face, so two cubes use two faces.