# Q3W18 Pre-Algebra

Key to Dilation Notes from Wednesday’s Whole Group:  Dilations Notes 1 KEY

Key to Rotation Notes from Thursday’s Whole Group:  Rotations Notes 1 KEY Teacher Carol Barnes Pre-Algebra 8th Week 18 Jan. 4-7 Unit 5 Geometry
Standard(s) Taught
 Standards Taught: MAFS.8.G.1.1: Verify experimental properties of rotations, reflections and translations: a. Lines are taken to lines, and line segments to line segments of the same length. b. Angles are taken to angles of the same measure. c. Parallel lines are taken to parallel lines. MAFS.8.G.1.2: Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them. MAFS.8.G.1.3 Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates.
Learning Targets and Learning Criteria
• be able to dilate a polygon on the coordinate plane for an enlargement or reduction.
• review transformations to reflect, translate, rotate, and dilate polygons on the coordinate plane.
• know the definition of similar and why dilation alone is not enough to determine similarity.
Classroom Activities

Wednesday  (continued to Thursday):

Bell Ringer:  Which of these numbers are rational?  The square root of 400?  The square root of 3?   The negative of the square root of 9?  The negative of the square root of 17?  Pi?  22/7?  1.256?

Large Group:  Watch video on dilations.  Here is a link to the video:  Dilations: Geometry Transformations Explained! – YouTube . Take notes on dilations.   A dilation is an enlargement or reduction of a figure (usually a polygon for our unit of study) drawn on the coordinate plane (a graph).  We will do the four examples on the front of the note-taking page on the board.  Here is a link to the note-taking page:  Dilations Notes 1

Small Group:  Students will do problems 5, 7, 9, and 11 on the back of their paper with classmates at their table.  They may compare answers and explain problems to each other.

Independent Group:  Students will do problems 6, 8, 10, and 12 on the back of their paper independently.  Teacher will grade answers and help students correct mistakes.

Homework:  Students will do Khan Academy:  S.2 dilations (to 80%)

Thursday:

Large Group:  Watch video on rotations.  Here is a link to the video:  rotation video math – Google Search .  Review notes on rotations.   A rotation is a turn of a figure (usually a polygon for our unit of study) drawn on the coordinate plane (a graph).  We will do the four examples on the front of the note-taking page on the board.  Here is a link to the note-taking page:  Rotations Notes 1

Small Group:  Students will do problems 5, 7, 9, and 11 on the back of their paper with classmates at their table.  They may compare answers and explain problems to each other.

Independent Group:  Students will do problems 6, 8, 10, and 12 on the back of their paper independently.  Teacher will grade answers and help students correct mistakes.

Homework:  Students will do Khan Academy R.13 (to 80%)

Assignments Due

From Notes on Dilations, Problems 6, 8, 10, and 12.

From Notes on Rotations, Problems 6, 8, 10, and 12.

Khan Academy:  R.13 (rotations) and S.2 (dilations)