Lesson 30: Multiplication, Addition & doubling
Lesson 30 Learning Objectives:
Use arrays to understand the distributive property
Multiply large numbers by breaking them into smaller numbers
Use doubles and doubling to multiply mentally
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Reflect
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 30 for more reflection questions, real life anchoring ideas, playful explorations and creative invitations.
Explain why doubling 12 to get 24 helps you know what 12 × 4 is—without calculating it directly. What’s the connection between doubling and multiplying?
You want to solve 9 × 17. What’s an easy way to break apart 17 to make this easier?
When you see a big multiplication problem, how do you decide which strategy to use?
Think of something you do every day—like steps to the kitchen, claps in a rhythm, or beads on a bracelet. If you double it once, what happens? If you double it again, what happens? How does this feel similar to how numbers grow when we multiply?
Math Talk:
What Math Lives Here?
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
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