Lesson: Introduction to the linear equation
Time : (2 x 40 minutes)
Grade: Eight, Junior Secondary School students
Goals: After the students follow the lesson, they are able to:
- communication about mathematics during the discussion;
- learn to improve their reasoning skills by presenting the result of their work;
- learn how to improve their critical attitude by conflict to other students opinion;
- construct the relevant mathematics concept (in this case: linear equation) from a contextual problem, and
- produce a solution in their own strategies.
- Give the students a contextual problem that related to the topic as the starting point.
For example: Anisa bought an apple and two mangoes in a supermarket. She gave Rp. 3.500,- to the seller. Right after that, Ilham paid Rp. 4.000,- for two apples and a mango. So, can you determine 1) how much is the prize for an apple. 2) how much is the prize for a mango?
- By moving around find out which students or groups have the ‘clever’ or intended strategy. This information is important in discussing session.
- Stimulate the students to compare their solutions.
- Ask the student or the group of students to present their answer in front of the class.
- Guide the students in a class discussion
- during the instruction, give another problem in the same context ( see figure below).
For example: Salma paid Rp. 5.000,- for two apples and two mangoes when she bought them in a supermarket. In the same supermarket, Ihsan had to pay Rp. 2.500,- to the seller for an apple and a mango. So, can you determine 1) how much is the prize for an apple. 2) how much is the prize for a mango?
- As a home work, asking the students to write a short essay (on a piece of paper) about their experiences after they have learned the two lessons