Lesson 57 Learning Objectives:
Use a box as a symbol to represent unknown numbers in addition and subtraction equations
Write and solve addition and subtraction equations with unknowns in all positions using diagrams and without using diagrams
Use diagrams and the relationship between multiplication and division to write and solve multiplication and division equations with an unknown number
Math Talk:
See Math Talk image below
Didax: Balance scale
Play with balancing the sides of the scale using different number
Reflect:
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 57 for more reflection questions, real life anchoring, playful explorations and creative invitations.
What changes when the box is in a different place?
How does the unknown help you understand the problem?
What surprised or confused you about equations and finding the unknown?
Consider this idea and how it connects to your understanding of finding the unknown in an equation: Algebra begins with listening to what is not yet known. Wonder begins with not knowing.
Math Talk:
What math lives here?
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
Which one doesn't belong? Can you think of a way that each of the equations doesn't belong?
Design by LM with Polypad
