Introduction
If you are like me, you are figuring out the best way to teach your eighth graders their favorite subject — math. Additionally, you may also be like me if you use the Illustrative Math: IM Grade 8 Math™ curriculum. Let’s take a journey to walk through how to make the first unit of eighth grade manageable, fun, and most importantly, accessible, for your students!
Lessons 1 – 10 : Rigid Transformations
Before I start any unit, I take a look at the necessary vocabulary that students are going to need to know from prior units or years. Then, I look for what new vocabulary they are going to learn and use throughout the unit. To help you in your teaching journey, I have created some scaffolded notes that align to the IM Grade 8 Math™ curriculum!

My biggest advice for teaching using this curriculum is to follow the format of think, pair, share. How I structure this is as follows:
Think
In my classroom, we call the “think” time Quiet Think Time. This makes the message clear that students are expected to be quiet during at the start to allow everyone time to think. Depending on the question, this quiet think time can be anywhere from 20 seconds to 40 seconds. I find that this allows enough time for students to at least start the problem if not completely answer the question and come up with an explanation.
Pair
I call this Turn and Talk. Again, this makes it clear that the students are expected to turn to their neighbor and talk about their answers. Making these expectations explicit leaves no gray area for students to wander through. I find that the majority of tables do share their answers and explanations well because they had sufficient time to think about their answers first.
Share
This is where the type of question dictates what response you are looking for. Is the question a multiple choice question? Then ask students to raise their hands to show their choice! Is the question “this” or “that”? Then have them move to two sides of the room to show their answers! Is the question open ended and requires some explanation? Then have students share out their answers and explanations!
A lot of the opening questions and questions you will encounter in these lessons are more open ended. This is the nature of rigid transformations since there are endless ways to go from the pre-image to the image. Since there are so many ways to arrive at the same answer, having the students share their answer and how they got their allows for everyone to think in a variety of ways and ways that they may not have even seen before.
While teaching this unit, I found that students required for practice with rigid transformations. The provided practice problems were not enough for students to master the standard. Due to this, I created a study guide for the mid-unit assessment and the end-of-unit assessment.

These study guides are aligned to the assessments in the curriculum and give students additional practice. I have found that the students who complete the study guides are more confident in their answers, are better prepared for the assessments, and can assist their peers in figuring out the problems.
These study guides were a game changer for me because students will always have something to do if they finish their practice problems early. Additionally, in order for my students to retake their summative assessments they must complete the study guide, have me check their answers, and we talk through any questions that they may have gotten wrong. This allows for a more reflective experience for myself and my students.
Lessons 11 – 17 : Congruence
The second half of this unit revolves around shape and angle congruence. I found that a lot of my students did not have the necessary vocabulary to answer a lot of the questions about different types of polygons. I asked my students “what is a rhombus?”… no response. I told my students “draw a parallelogram”… I got every shape but a parallelogram. That’s when I knew I needed to give my students some scaffolded notes on different types of polygons and how they are related.
The curriculum only teaches a handful of angle pairs– just the basics to get by. While that is fine, I found that students were making the connections to more complex angle pairs. An example of this is that you could go from a vertical angle to an alternate interior angle, or you could have a corresponding angle. I also noticed that sentence structures for writing the angle pair proofs was not easily accessible in the provided curriculum. Therefore, I had students practice the sentence structure the practice problems and the study guide for this part of the unit.
I like to make the learning process as fun and engaging as possible. I created a trading card-like game where students use rigid transformations to battle monsters. If you want to level up your review activities, check out the review trading card game below.








