Does the new name really match?
Use a visual model to recognize equivalent names and repair false changes.
Explore this lesson →12 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Check measure against the same whole, not whether written numbers look larger.
- Equal number-line endpoints can justify equivalence on a shared scale.
- Changing only one count or applying an additive rule is not equal subdivision.
Something to notice
Ask the learner to show why one proposed record fails and repair its intended transformation. Accept a valid explanation that identifies the same mathematical error in another way.
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 4 · 4.NF · 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.