Cogito
Grade 2 Math · Chapter 8 · Lesson 4
Cubes and Solid Shapes
Faces, edges, and corners.
10 problems · about 11 minutes · 2.G.A.1
What this lesson teaches
The child identifies a cube and describes solids by their faces.
- A cube has 6 faces and every one is a square.
- A square is flat. A cube is solid.
- Solids are described by their faces.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
3 problemsReview — Shapes by Their Sides: A shape has 6 straight sides. What is it?
Answer A hexagon.
Why 6 sides makes a hexagon.
Review — A.M. and P.M.: Is 3 o’clock in the afternoon a.m. or p.m.?
Answer p.m.
Why Afternoon times are p.m.
Review — Time to Five Minutes: The long hand is on the 5. How many minutes past?
Answer 25
Why The 5 means 25 minutes.
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many faces does a cube have?
Answer 6
Why A cube has 6 square faces.
What shape is every face of a cube?
Answer A square.
Why Every face of a cube is a square.
How many square faces does a cube have?
Answer 6
Why All of them are squares.
Build It Up
The same ideas with more to keep track of.
1 problemHow many flat faces does a cylinder have?
Answer 2
Why Top and bottom.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
3 problemsWhich one is solid?
Answer A cube.
Why One of them you can hold.
The Dice: How many faces does a cube have?
Answer 6 faces
Why A cube has 6 faces.
Flat or Solid: Is a square flat or solid?
Answer Flat. You can draw it.
Why A square is flat; a cube is the solid made of squares.