Development of Learning Devices Based on Realistic Mathematic Education to Improve Mathematical Communication of Students at Senior High School

This research is intended to describe: 1)
validity, practically and effectivity of devices which is
developed by using Realistic Mathematic Education; 2)
Enhancement of student’s mathematical communication
which used teaching and learning devices developed. It
used 4-D model which consists of four stages: defining,
designing, development and disseminate. The subjectis
gradeXIof Senior High School 1 Barumun Tengah. The
result of test I and test II showed that (1) Teaching and
learning tools developed is valid both in terms of content
and construct; (2) Teaching and learning Devices
developed was easily used seen by students’dan teacher’s
response; (3) Teaching and learning Devices developed is
effective, seen by student’smathematical communication;
(4) an increase of student’smathematical communication in
test I is 76,91 raised into 82,16 in test II.