Lesson 9: Adding: Strategies & Large Numbers
Lesson 9 Learning Objectives:
Use mental math strategies to add two-digit numbers
Solve problems involving two-digit addition
Add 3- and 4-digit numbers with and without regrouping
Embedded Files
Reflect:
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson 9 guide for more reflection questions, real life anchoring, playful explorations and creative invitations.
What mental math strategies feel helpful in your brain?
Describe a moment of surprise, frustration and/or ease when using mental strategies to add large numbersÂ
Math Talk:
What Math Lives Here?
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
What does the squirrel understand? Which basket would you choose? Why might you choose the other one? If you need 500 mushrooms for your community soup dinner, how many more baskets do you need to collect? What does the squirrel think about that?
Image co-designed by Aiden Cinnamon Tea (Open AI) and LM
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