Abstract:
The purposes of this research were to develop (Lesson for teaching mathematics on the
topic of Power for mathayomsuksa1 students based on the efficiency 80/80, to find out the
Effectiveness Index of mathematics (Learning activities by using induction method and
Think-Pair-Share technique on Power for mathayomsuksa1 students. The samplegroup was 82
students who studied in mathayomsuksa1 and used to study on Power at Muangthalang School,
Phuket Province, in 2ndSemester of 2017 Academic Year. The participants were voluntarily
recuited. The research insruments included (Learning activities plans and mathematical (Learning
achievement tests.
The results of this research were shown that the efficiency of the Mathematics (Lesson
was 82.51/80.06, the Effectiveness Index was 41.39%.