Abstract:
Problem background of this research are the students still having the character of passive and
also difficult to comprehend lesson materials. In this Cooperative Learning model TAI type
emphasizing at combination between individually and group study, so the students can accept the
learning easier. The form of this research is Classroom Action Research with the subject of this
research are the students on the class V-C SD Negeri 161 Pekanbaru. The objective of this
research is to improve the mathematics learning outcome of the students on the class V-C SD
Negeri 161 Pekanbaru by applying Cooperative Learning model, Team Assisted Individualization
(TAI) type. The data in this research is quantitative data which get by the test of students learning
outcome through daily repetition and also the data of teacher and students activities which get by
the observation sheets of teacher and students activities. The result of this research shows that the
percentage mean of teacher’s activities in cycle I was 85% (Very Good), in the cycle II increased
become 90% (Very Good), and in cycle III increased again become 96,25% (Very Good). While
the percentage of student’s learn activities in the cycle I was 83,75% (Very Good), in the cycle II
increased become 86,25% (Very Good), and in the cycle III increased again become 93,75% (Very
Good). The mean of students learning outcome in basic score was 68,8 increased become 79,75 in
the cycle I, increased again become 86,12 in the cycle II, and increased again become 91,45 in t he
cycle III. As a whole, there are improvement in every cycle. It means that applying the Cooperative
Learning model, Team Assisted Individualization (TAI) type can increase the mathematics
learning outcome of the students on the class V-C SD Negeri 161 Pekanbaru
