This video tutorial for fourth-grade students covers decomposing angles using pattern blocks. It begins with an introduction to the concept and demonstrates how to decompose angles in hexagons, triangles, and trapezoids. The tutorial also explores creating 180° and 90° arcs and solving for angles in complex shapes. The lesson emphasizes logical reasoning over using tools like protractors.

What is the main focus of this lesson?

• Understanding fractions

• Learning to use a protractor

• Decomposing angles using pattern blocks

• Learning about symmetry

What is the measure of each angle in a hexagon when using pattern blocks?

• 180°

• 90°

• 120°

• 60°

How many hexagons are needed to form a full rotation?

• 2

• 3

• 4

• 6

What is the measure of each angle in a triangle using pattern blocks?

• 90°

• 30°

• 45°

• 60°

How many triangles are needed to form a straight line?

• 5

• 4

• 3

• 2

What is the measure of each obtuse angle in a trapezoid using pattern blocks?

• 90°

• 120°

• 180°

• 150°

How many trapezoids are needed to form a full rotation?

• 2

• 5

• 3

• 4

What is the measure of each small angle in the complex pattern using pattern blocks?

• 60°

• 15°

• 45°

• 30°

How many pieces are needed to form a full rotation in the complex pattern?

• 16

• 14

• 12

• 10

What is one way to create a 180° arc using pattern blocks?

• Three triangles

• One hexagon and two small pieces

• One trapezoid and two triangles

• Two hexagons