Unit 8: Introductory Geometry and Spatial Reasoning

Day 5 of 30

Compose new shapes from other shapes

K-2Mathematics

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Learning Objective

I can explore compose new shapes from other shapes.

Today's Lesson

Today we will learn about compose new shapes from other shapes. Math helps us solve problems and understand the world around us.

Geometry is the study of shapes, sizes, and the properties of space. Basic shapes include circles, triangles, squares, and rectangles. We learn about angles (corners where two lines meet), lines (straight paths that go on forever), and points (exact locations). Understanding geometry helps us describe the world around us and solve problems about distance, area, and volume.

Let's break this down step by step so it's easy to understand. Follow along with the examples, and don't worry if it takes some practice to get the hang of it!

Remember: Making mistakes is part of learning. If something is tricky, try again, look at the examples, or ask for help.

Key Terms
Problem

A question we need to solve

Solution

The answer to a problem

Activities
Instructions
1. Use objects or pictures to explore compose new shapes from other shapes. 2. Try the examples together. 3. Solve practice problems. 4. Check your work.
Materials Needed
  • Counters or objects
  • Pencil
  • Practice sheet
Practice Problems
1

Show two ways to make 10.

Hint: Think about addition pairs: 1+9, 2+8, 3+7...
2

Break apart 15 into tens and ones.

Hint: 15 = 1 ten and ___ ones
3

What is another way to write 23?

Hint: Think about tens and ones, or addition.

Teaching Tip

For younger learners: Use concrete objects and hands-on activities when teaching compose new shapes from other shapes. Keep sessions short (10-15 minutes) and incorporate movement or songs when possible.

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