모양 비교 단원 1 설명 수학

 In this lesson, you'll learn what a scaled copy is and how to tell if a picture or shape is a scaled copy or not. You'll practice explaining changes with numbers, like saying, “All the lines are twice as long” or “Everything is one-third the size.”

This lesson is made for everyone, no matter how much math you already know, and it helps you solve problems step by step. 

 In this lesson, you'll learn about scaled copies and how to figure out if a shape or picture is a scaled copy of another. A scaled copy looks the same as the original shape, just bigger or smaller, without being stretched or squished. You'll also see that all the lines in a scaled copy change by the same amount—like if one line is half as long, all the other lines will be half as long too.  
You’ll practice explaining these changes with numbers. 

 You'll draw your own scaled copies of simple shapes, both on grids and without them. You'll also see that scaling works by multiplying, not adding.  You'll get to explain your thinking about how scaling works and use tools like tracing paper or index cards to help you. As you work, try to use words like "scale factor" and "corresponding" to explain your ideas. 

 In this lesson, you’ll explore the distances between points that aren’t connected by lines in both scaled and regular shapes. You’ll see that when one shape is a scaled copy of another, the distances between the points follow the same scale factor as the sides of the shape.