A familiar fact, a new unit
Use a one-digit fact to count tens, then explain the total in ones.
Explore this lesson →16 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- A fact can count different units. Six groups of four ones make twenty-four ones. Six groups of four tens make twenty-four tens.
- Find the number of tens with the one-digit fact. Then use ten ones in every ten to find the total in ones.
- Changing ones to tens changes the amount. Moving the same tens into hundreds keeps the amount. Say which change you are making.
Something to notice
Revisit unfamiliar one-digit-by-multiple-of-ten products across days. Ask what the basic fact counts and why converting tens to ones works. Accurate untimed responses show accuracy on those attempts; they do not establish fluent recall or verified free-written reasoning.
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 3 · 3.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.