Miss M. Carmelle Nesbitt • 7th Grade Math • Wednesday, June 23, 2010 • Per: 4
Reflections and Translations (Formal Eval
#2)
Objectives:
 TSW define reflections and translations. (DOK 1, 3d)
 TSW perform translations using a coordinate plane. (DOK 2, 3d)
 TSW perform reflections using a coordinate plane. (DOK 2, 3d)
Materials:
 Pencil and paper, transparencies, overhead projector, dry erase markers, erasers, worksheets,
“thinking caps,” shapes
Bell Ringer: (5 min)
1. What is your favorite line dance or dance?
2. Where did you learn to do this dance?
3. Where do you usually practice this dance?
 Review
Set: (6 min)
 Cha-Cha Slide
o What moves did we make in the Cha-Cha Slide?
 Move to the left, right, backward, forward (hop).
o Watch ourselves in a mirror.
 Reflection
 Just like in the Cha Cha Slide, in geometry we move and slide shapes on the coordinate plane.
We also reflect or perform reflections with shapes.
 Today we will be learning how to perform translations and reflections using a coordinate plane.
Procedure: (25 min)
1. TTW define reflection and translation.
o Reflection- a FLIP across a line
 As in a mirror- “Mirror, mirror on the wall!”
 reFLection = FLip
 opposite, appears to be reflected
o Translations- A SLIDE moves in one direction from one place to another
 As in the Cha-Cha Slide- “Cha Cha Slide!”
 tranSLations = SLide
 looks exactly the same, in a different position
o Prime- new figure


2.
2.
3.
 Original image = A
 New image = A’
When I say reflection- Mirror, mirror on the wall
o Translation- Cha-Cha Slide!
Check for understanding.
TTW model performing translations and reflections on a coordinate plane. (GP)
o Using shapes, numbers
 Point, 1 triangle, the letter E, number 4, hand, arrow
o Reflect across x-axis, y-axis, random line (toothpick)
o Translate- units up/down, left/right
o Vertice chart with original and new
TSW complete worksheet (IP).
o Give amount of time to work on worksheet!!! (8 mins)
TTW review worksheet with students using transparency.
Closure (10 min)
 Today we learned reflections (mirror mirror) and translations (cha cha).
o What is a reflection?
o What is a flip?
o What is the name of the new image?
o Model a reflection.
o Model a flip.
 On your index card, write 3 things you learned today and have a clear understanding of.
o On the back of the card, write a concept you are still a little confused about.
 Tomorrow Miss K will teach you about rotations.
Assessment/Evaluation:
 TSW define reflection and translation. (DOK 1, 3d)
o Formal: TTW administer a written test (M) including defining reflection and translation
using the coordinate plane (C) which will be graded and recorded using Engrade (D).
o Informal: TTW monitor students (M) to gauge their understanding as they respond to
questions verbally and using their coordinate plane worksheets (C).
 TSW perform translations using a coordinate plane. (DOK 2, 3d)
o Formal: TTW administer a written test (M) including performing translations using the
coordinate plane (C) which will be graded and recorded using Engrade (D).
o Informal: TTW monitor students (M) to gauge their understanding as they respond to
questions verbally and using their coordinate plane worksheets (C).
 TSW perform reflections using a coordinate plane. (DOK 2, 3d)
o Formal: TTW administer a written test (M) including performing reflections using the
coordinate plane (C) which will be graded and recorded using Engrade (D).
o
Informal: TTW monitor students (M) to gauge their understanding as they respond to
questions verbally and using their coordinate plane worksheets (C).