A ribbon parade
Put three objects in order by their lengths.
Explore this lesson →5 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Length is how far an object reaches from one end to the other.
- Line up the starting ends. The object that ends first is shortest.
- Order all three. Moving or changing the color of a ribbon does not change its length.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 1 · 1.MD · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.