Mathematics 5 curriculum guide 2015 I table of contents acknowledgements

Suggestions for Teaching and Learning
Students will be expected to:
Shape and Space (Transformations)
5SS7.3 Reflect a given 2-D 
shape in a line of reflection, 
and describe the position and 
orientation of the image.
Students should make the connection between symmetry and the line of 
reflection. The line of reflection creates symmetry between object and 
image whereas a line of symmetry typically refers to symmetry within a 
given object.
Review Mira
TM
use. Students should be familiar with them from their 
work with symmetry in Grade 4.
The image produced by a Mira
TM
is considered a reflection. Students 
could practice drawing/tracing a shape using a Mira
TM
- noting location 
of the line of reflection - or use tracing paper to trace a 2-D shape and 
the image formed by the Mira
TM
. They could place the traced image 
over the original to reinforce that reflections are congruent images. 
Remind students that when labeling a 2-D shape and its reflected image, 
prime notation should be used. For Grade 5, lines of reflection should 
be limited to vertical and horizontal lines.
Students should note that for reflections:
• a 2-D shape and its image are congruent
• a 2-D shape and its image are of opposite orientation (i.e., if we 
go around the object ABCD in a clockwise direction, the image 
A'B'C'D' would require a counter-clockwise direction).
• a 2-D shape and its reflected image are equal distance from the line 
of reflection.
Encourage students to add this information to their graphic organizer.
Given a shape, such as rectangle ABCD, and a line of reflection, 
students should reflect the shape, resulting in the image A'B
'
C
'
D
'
.
Recognizing that the shape and its image are always equal distance from 
the line of reflection is key to producing its reflected image.
The direction and magnitude of the move is described by stating the 
direction of the reflection (e.g., in a horizontal line of reflection) and the 
distance each vertex is from the line of reflection.