Ten tens become a hundred
Build a hundred without adding or removing any ones.
Explore this lesson →6 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- A ten is made of ten ones. Ten of these tens make 100 ones.
- Bring ten tens together to make one hundred. The grouping changes, but the value stays the same.
- Count hundreds as bundles: two hundreds are 200, three are 300, and so on.
Something to notice
Ask learners to bundle physical tens, explain zero in a numeral, read and write fresh number names, and continue a count from an unfamiliar start. Screen models and typed answers support these ideas but do not establish handwriting skill or independent explanation.
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 2 · 2.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.