Cogito
Grade 1 Math · Chapter 9 · Lesson 5
Shapes Inside Shapes
A shape you built can become a piece of something bigger.
10 problems · about 12 minutes · 1.G.A.2
Figure — use these to answer the problems
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsFrom “Making New Shapes”
How many triangles fill one hexagon?
AnswerFrom “Naming Solid Shapes”
A can of soup is shaped like what?
- A cylinder.
- A cube.
From “Naming Flat Shapes”
A shape has 6 straight sides. What is it?
- A hexagon.
- A square.
From “What Makes a Shape a Shape?”
How many corners does a triangle have?
Answer
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many triangles make one trapezoid?
AnswerCan a piece be made of smaller pieces?
- Yes.
- No.
How many triangles make one rhombus?
Answer
Build It Up
The same ideas with more to keep track of.
1 problemHow many triangles make one trapezoid?
Answer
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsHow many triangles are in 3 rhombuses?
AnswerCounting the Small Pieces
A trapezoid is 3 triangles. How many triangles are in 2 trapezoids?
Answertriangles