I changed it up this year and introduced these pages before my quadrilaterals flip-book (you can find in previous post ). I had students tape down properties of parallelograms, rectangles, rhombi, and squares on the left side of their notebook and had them tape down properties of trapezoids on the right side.

I told students, every day that we go through the different types of quadrilaterals, I want you to reference this page and write down key information that will help

**remember. This will be your own personal "quadrilaterals cheat sheet" and its sole purpose is to help you come up with your own way to remember the properties.**__you__
After the unit was done, I glanced through students notebook and wrote down the most common notes. The pictures below are what most of my students ended up writing down in their INB. I did not provide students with any information to write down.

After students taped down the blank properties in their INB, I had students complete a quadrilateral card sort. I told students to sort the cards and write down a short paragraph on why they chose to sort their cards that way.

The following are the 3 most popular categories that students chose to sort their cards.

__Popular Category #1:__5 different groups

*Group 1:*Angles on cards J, F, P, G, H, and C are all congruent.

*Group 2:*Angles on cards N and L are supplementary.

*Group 3:*On card A, only half of the diagonals marked.

*Group 4:*On cards I, D, O, and M, the angles marked are supposed to represent ninety degrees.

*Group 5:*On cards E, K, and B, the diagonals are congruent.

__Popular Category #2:__2 different groups based on angles and diagonals

*Group 1:*On cards C, D, F, G, H, I, J, L, M, N, O, and P, angles are marked in the picture.

*Group 2:*On cards A, B, K, and E, diagonals are marked or given in the picture.

__Popular Category #3:__2 different groups

*Group 1:*

Students placed these cards in the same group because they are all part of the parallelogram "family."

*Group 2:*

Students placed these cards in the same group because they have their own family since they do not have two pairs of parallel sides.

This was my first card sort activity where I allowed students to choose how they wanted to sort the cards. Definitely going to be making more card sorts like these in the future!

**Here are the files that I used if you would like to use!**