COMPILING THE WISDOM OF OUR/IM 8TH GRADE TEACHERS FROM AROUND THE COUNTRY TO MAKE THESE TIP SHEETS FOR TEACHER IN MY DISTRICT. THESE TIPS DO NOT REPLACE A THOROUGH READING OF THE AMAZING TEACHER NOTES PROVIDED BY THE AUTHORS AT ILLUSTRATIVE MATHEMATICS. BEGIN YOUR LESSON PLANNING THERE. YOU CAN FIND THOSE LINKED HERE.
This short week we will finish the first half of unit 1, and since it is our first time through, in many classrooms there is a little clean up and review necessary.
Lesson 8 was focused on rotation patterns, giving students more practice with this most difficult-to-master transformation, and give them opportunity to gain experience and noticing begin things about rotation line segments. Any other things that might be discovered are NOT the main learning goal of the lesson, which is simply:
- Introduce figures which are built by applying several transformations to one starting figure.
- Practice rotating line segments around various points.
Moral of the story – Don’t over-teach!
Hints for 8.3 –
- have students who are struggling look back at how they did 7.3 last week.
- Some students see the warm up has a center point they all rotate around and may look for a center point for this figure as well. Watch for that method as you circulate so you can call on that student to share their thinking ( mini 5 Practices opportunity for those of you working on using this teacher move)
Lesson 9 builds on these experiences, focusing on how translations effect parallel lines.
Both these lessons are full of opportunity to build a strong class culture full of curiosity and cooperation. Students should play and discover ways to move a figure from on place to another, and should appreciate the variety of ways found by their classmates. They should practice explaining their thinking and trying to understand the thinking of others.(MP 3) Having classmates try their methods out should naturally uncover their need for increased precision (MP 6) in their language and any misunderstandings about how the different transformations work.
Something to focus on:
One of the three learning goals of lesson 9 is
“Understand that parallel lines are taken to parallel lines under rigid transformations.”
This is something our previous curriculum did not emphasize, but the explanation for problem 7 from the end of unit assessment is built on this fact, so don’t skip it.
Lesson 10 finishes the idea that transformations preserve angle measure and segment lengths. Note that they are to be finding segment lengths and angle measures WITHOUT MEASURING. In the mid unit assessment they will see a problem very similar to the cooldown from lesson 10, so make sure your lesson synthesis hammers home they fact that they can figure out these measures without using rulers or protractors.
Teachers around the country are creating review materials for this mid unit assessment.
Sarah Kallis made Kahoot review for mid unit assessment.
Erica Ympa made quiz for this first half of the unit.
Matt Parker used Desmos Transformation Golf with his class to give them extra practice with their transformations.
Anne Agostinelli shared this great review strategy for revisiting cool downs. Maybe using it as you review for a test would be a good way to try it out.
Here are the slides she used with her students for this “Icon Feedback” Activity.