Cogito
Kindergarten Math · Chapter 8 · Lesson 1
Naming Flat Shapes
Squares, circles, triangles, rectangles.
10 problems · about 8 minutes · K.G.A.2, K.G.B.4
What this lesson teaches
The child names flat shapes regardless of size or orientation.
- Shapes are named by their sides and corners.
- Turning a shape does not change its name.
- A circle has no straight sides at all.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Ten More on the Chart: Ten more than 32?
Answer 42
Why Forty-two.
Review — Counting by Tens: Five bundles of ten. How many?
Answer 50
Why Fifty.
Review — Counting by Ones to a Hundred: What comes after 49?
Answer 50
Why Fifty.
Review — Comparing Teen Numbers: Which is bigger, 14 or 18?
Answer 18
Why Eighteen.
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many corners does a rectangle have?
Answer 4
Why Four.
How many sides does a square have?
Answer 4
Why Count around.
How many corners does a triangle have?
Answer 3
Why Three.
Build It Up
The same ideas with more to keep track of.
2 problemsHow many sides does a circle have?
Answer 0
Why No straight ones.
Does turning a shape change its name?
Answer No.
Why The sides stay the same.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Sides: A shape has three straight sides. What is it?
Answer A triangle.
Why A triangle.