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Cogito

Grade 1 Math · Chapter 9 · Lesson 1

Practice Worksheet

What Makes a Shape a Shape?

Some things about a shape matter. Some do not.

10 problems · about 11 minutes · 1.G.A.1

NameDate

Figure — use these to answer the problems

Turn the triangle and make it bigger. Watch the counts below.

Triangle

Straight sides

3

Corners

3

Turn it0
Size38
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

  1. From “When the Ones Make a Ten”

    16 + 17 = ?

    Answer

  2. From “Adding Two-Digit Numbers”

    21 + 14 = ?

    Answer

  3. From “Word Problems Within 40”

    Whole 35, one part 15. Other part?

    Answer

  4. From “Tape Diagrams for Stories”

    Parts of 13 and 12. What is the whole?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. How many corners does a triangle have?

    Answer

  2. Is a tiny green triangle still a triangle?

    • Yes.
    • No.

  3. How many sides does a triangle have?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. Does turning a shape change what it is?

    • No.
    • Yes.

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. Which one decides the shape?

    • How many sides it has.
    • What colour it is.

  2. Two Shapes

    A big blue triangle and a small red one. Are both triangles?

    • Yes. Both have 3 sides.
    • No. They look different.