Applying an Algebraic Rule

As part of CMP3, there was a unit project that suggested enlarging a picture using an algebraic rule applied to the coordinates. The standard it was addressing was recreating a drawing of a different scale. I thought that I would give it a try.  So the process began.  I decided to pick different pictures for the students to do, approximately 15 different ones.  1st period, I had them download the picture, put the grid on the picture and print it.  What a disaster.  2nd period, I had them start their grid while I printed pictures with grids on them already.  Much better!

Each student had to choose either to enlarge or shrink their picture.  Majority picked enlarging which was fine with me!  Next thing they had to do was start to create their grid.  We used big paper and marked off at each centimeter and connected the dots.  This also took way longer than expected.  Not for future self, buy large graph paper!  Once the grid was drawn, it was time to start identifying coordinates on their original image, apply the geometric rule and graph their new point.

For some this went well, others, needed some help.  I would say that by the end of it, 99% of students were able to this independently.  As you can see below, each student had their original picture and their coordinates on hand while creating their masterpiece.  It was a combination of both of these that allowed a student to be successful. 

Here is a picture of a completed shrinking.  I love it!

Overall I would say the was just ok.  To improve, I would have had graph paper already in the desired large size and had the pictures ready to go from the beginning.   With these changes, I think that it will go a lot smoother!

I finally put these up in the hallway.  I will snap a picture soon and post it here!