POLYGONS (for children with dyscalculia): October 2013

A Semi – Detailed Lesson Plan

In Mathematics 3 – St. Michael Gabriel

10:30 A.M – 11:15 A.M

Kristine Ida D. Galamgam September 11, 2013

Pre-Service Teacher

I. Objectives

At the end of the lesson, the pupils must be able to:

1. Define polygon;

2. Classify polygons according to the number of sides;

3. Explain the difference between regular and irregular polygons;

4. Appreciate the importance of polygons in daily living.

II. Subject Matter

A. Topic – Polygons

B. Reference – Math and Beyond pp. 56-59

C. Materials – Chalkboard, pictures, DVD player, T.V, worksheets, box, chairs

III. Lesson Proper

A. Motivation

The teacher will present a video presentation to her students about shapes and polygons.

B. Presentation

The teacher will put three pictures (table, slice of a cake, and bagua mirror) on the chalkboard and will ask her students if they know the picture. The teacher will let the students describe the picture.

The students will say their observations and they see shapes.

One of the students will say that these are shapes of a rectangle, triangle, and octagon.

The teacher will now present that the shapes they have seen are called “Polygons”.

Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed".

Polygons are classified according to their sides.

TRIANGLE is a polygon that has 3 sides and 3 angles.

QUADRILATERAL is a polygon that has 4 sides and 4 angles.

PENTAGON is a polygon that has 5 sides and 5 angles.

HEXAGON is a polygon that has 6 sides and 6 angles.

HEPTAGON is a polygon that has 7 sides and 7 angles.

OCTAGON is a polygon that has 8 sides and 8 angles.

NONAGON is a polygon that has 9 sides and 9 angles.

DECAGON is a polygon that has 10 sides and 10 angles.

HENDECAGON is a polygon that has 11 sides and 11 angles.

DODECAGON is a polygon that has 12 sides and 12 angles.

Polygons can also be regular or irregular.

If all angles are equal and all sides are equal, it is regular polygon.

If all angles are not equal and all sides are not equal, then it is irregular polygon.

C. Application

The teacher will have an activity called “trip to polygon world”. This game is similar to the game “trip to Jerusalem” where the pupils will dance at the same time walk in circular motion and when the music stops, they’ll sit.

Each chair has a corresponding picture. The pupil will say what kind of polygon is that and will count how many angles and sides it has. If he/she gets the answer right, he/she will get points.

The game will continue until only one pupil is left.

D. Generalization

Polygons are closed plane figures made up of several line segments that are joined together.

Polygons are primarily classified by the number of sides.

POLYGON NUMBER OF SIDES NUMBER OF ANGLES

TRIANGLE 3 3

QUADRILATERAL 4 4

PENTAGON 5 5

HEXAGON 6 6

HEPTAGON 7 7

OCTAGON 8 8

NONAGON 9 9