Teacher Guide
Week 23
Lines, Angles & Symmetry — Teacher Guide
Monday: Points, Lines, Segments & Rays
1
Warm-up
1.
point, line segment, ray, line
2
Learn Table
1.
Student copies each figure — check endpoints/arrows drawn correctly
3
Identify
1.
ray, line segment, point, line, line segment
4
Number Talk
1.
Maya is wrong — a line goes on forever so it is longer; we just can't draw all of it
2.
Ray: starts at one point, shines on forever; segment stops at both ends
5
Challenge
1.
Letter A: usually 3 segments; accept any correct construction, compare counts
Page break
Tuesday: Right Angles
1
Warm-up
1.
T, F, T, F
2
Learn
1.
Point out square-corner mark □
3
Estimate First
1.
yes (90°), no (60°), no (110°), yes (90°) — praise honest estimates
4
Right Angles in Shapes
1.
Square: 4, Rectangle: 4, Triangle: 0 (this one), Circle: 0
5
Two Ways
1.
Any two: paper corner, book corner, folded circle, index card
Page break
Wednesday: Lines of Symmetry
1
Warm-up
1.
Any 3 right angles: door, window, book, table corner...
2
Learn
1.
Emphasize FOLD test — both halves match exactly
3
Draw Lines
1.
Heart: 1, Square: 4, Triangle (equilateral): 3, Rectangle: 2, Arrow: 1
4
Word Problems
1.
Rosa's heart: 1 line of symmetry
2.
Sister is right — a circle has endless lines of symmetry (every line through the center)
5
Create Own
1.
Fold test should show matching halves
Page break
Thursday: Geometry in the Real World
1
Warm-up
1.
YES (heart), NO (letter F), YES (square)
2
Word Problems
1.
Line segment — it has two endpoints (the corners)
2.
Two rectangles (cut through middles) OR two triangles (cut corner to corner)
3.
Yes — that is exactly what a line of symmetry means
3
Equal Shares
1.
Halves: 1 cut through middle; Fourths: 2 cuts; Circle halves: 1 cut through center
4
Number Talk
1.
Same! 2 fourths = 1 half
2.
Square has 4; two right triangles have 1 each = 2, so the square
5
Create Own
1.
Accept any problem using the week's vocabulary
Page break
Friday: Review & Self-Check
1
Warm-up
1.
C, A, B, D
2
Estimate First
1.
Square: 4, Heart: 1, Rectangle: 2, Triangle: 3
3
Mixed Review
1.
ray, right, 4, 1
4
Word Problems
1.
A square
2.
One vertical + one horizontal cut (cross pattern) makes 4 equal fourths; accept the two-diagonals X pattern too
5
Self-Check
1.
Accept student self-assessment and reflection