Classroom Video: Discourse and Questioning - Section 5: Closing

  Classroom Video: Discourse and Questioning
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10 Less: An Exploration

Unit 15: Base 10 Bonanza
Lesson 3 of 5

Objective: SWBAT explain why the ones place stays constant when subtracting 10 repeatedly.

Big Idea: The CCSS asks students to mentally find 10 more and 10 less, without having to count! This lesson helps students develop a conceptual understanding of +/- 10, which will give them the foundation they need to mentally calculate 10 more/10 less!

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