Another reason I find angle studies to be so much fun is that I LOVE watching students start to make connections between all the other work we have done and a brand new topic. Composing and decomposing? CHECK! Estimating? CHECK! Connecting to fractions? CHECK!
So the first thing I did to kick of this unit is to make sure that students understood the third grade concept of "right angles". You see, in the past, I have found a number of misconceptions related to this and this year was no exception. Many textbooks and worksheets present right angles looking the same way...something like this:
We first wrote "360 degrees" on the back to remind us of our "whole" circle.
Then we folded in half, traced that fold line, colored one half, and labeled it with "180 degrees". We talked about the concept of "straight angles" and noted that a full circle is comprised of two 180 semicircles. I had them fold again, trace the fold line on half of it, color a new color, and asked how many degrees it must be (they easily knew 90). Again, we tied it back to the full circle...being 1/4...1/2 of a 1/2...and so on. We then folded the circle into it's fourths so only the right angle was exposed and we went on a "hunt" around the room to find examples of right angles. We found them everywhere--the corner of the whiteboard, the lights, the door, their name tags...students were turning their "right angle finder" at all sorts of angles to find them! We then came back and folded our circle in half AGAIN to find a 45 degree angle and went back on a hunt!
This one was simply geared toward getting students talking about right angles and defending their thinking based on the foundation we had gotten with our folding activity.
No thank you!
Groups are required to go one card at a time and take turns leading the discussion. I circulate and ask probing questions, ask them to "prove" it to me, and so on.
Looking for angle help in your classroom? Check out this teaching tandem and see what you think!
Want to pin it later? Here's a pin for you!