Keep the fact, change the unit
Connect a known product to tens, hundreds and thousands.
Explore this lesson →8 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- A place unit has both a count and a value.
- Multiply the count of units, then connect it to the total amount.
- Changing a unit from ten to one hundred changes its value tenfold.
- A zero factor gives no items; a factor of one preserves the other amount. These boundaries still follow the unit meaning.
Something to notice
Ask what changes between seven ones, seven tens and seven hundreds multiplied by eight. Have the learner name the unit before finding the total. A trailing-zero rule alone does not explain the quantity.
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.NBT · 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.