Change one whole unit
Mentally add or subtract ten or one hundred from numbers 100–900.
Explore this lesson →8 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Think of ten as one complete ten and a hundred as one complete hundred.
- A zero place or a crossing can change neighboring digits. Keep track of the amount, not just one written digit.
- Check that the difference from the starting number is exactly ten or one hundred.
Something to notice
Ask the learner to explain why an exchange keeps the same value and connect their own drawing to a written method. Encourage different valid strategies. Untimed typed accuracy with worked models does not establish fluent independent calculation or 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.