standard_description: Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point).
problem_activity: Narrative
The purpose of this How Many Do You See is for students to subitize or use grouping strategies to describe the images they see. The images used introduce students to the context that will be used throughout the lesson.
When students use the placement of objects in a 10-frame, they look for and make use of structure (MP7).
Launch
Groups of 2
“How many do you see? How do you see them?”
Flash the image.
30 seconds: quiet think time
Activity
Display image.
“Discuss your thinking with your partner.”
1 minute: partner discussion
Record responses.
Student Facing
How many do you see?
How do you see them?
[IMG]
Student Response
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Activity Synthesis
“Noah created this art. He used his fingerprints in a 10-frame and then decorated them like animals.”
“Today, we will make our own fingerprint animals using ink and our thumbs.”


aligns: no