Classroom mode
Run it in class
What does a line of reflection symmetry guarantee?
Show of hands — before you project anything
Predict: if I add a bump to only one side of this shape, what happens when we fold it? Then we fold.
- A Way more than you'd guess
- B About what you'd guess
- C Way less than you'd guess
Count the votes out loud. Hold them to it — then watch.
Project it (fullscreen)
Discussion prompts
- Predict: if I add a bump to only one side of this shape, what happens when we fold it? Then we fold.
- Predict whether this shape that 'looks balanced' will actually pass the fold test — vote first, then check.
- Predict how many fold lines a square has versus a rectangle, then test each line by folding.
Where it shows up in real life
- Folding a paper snowflake or paper heart, where one cut mirrors itself across the fold
- A painted blot butterfly where folding makes matching wings appear
- Faces, leaves, and letters like A and M that are almost — but never exactly — mirrored
A prediction-first worksheet — no answer key.
zero prep · no login · any projector
Winding down at home? Family mode ·
Explore every question
What does a line of reflection symmetry guarantee?
Predict — what do you think will happen, and why?
Talk about it
- Predict: if I add a bump to only one side of this shape, what happens when we fold it? Then we fold.
- Predict whether this shape that 'looks balanced' will actually pass the fold test — vote first, then check.
- Predict how many fold lines a square has versus a rectangle, then test each line by folding.