Development of Mathematical Learning Devices Based on Model Problem Based Learning (PBL) to Improve Mathematical Communication Skills of School IT Jabal Noor Students Class VII

The purpos study are to produce mathematical
learning tools that are valid, practical and effective through
Problem-Based Learning (PBL) model to improve mathematical
communication skills of VII grade students of Jabal Noor IT
Middle School. Specific objectives in this study are to: 1) produce
mathematical learning devices that are valid, practical and
effective to be used in the teaching and learning process. 2) to
improve students' mathematical communication skills using
learning tools developed based on the PBL model. This research
is a development research developed with a 4-D model, namely
defining, designing, developing, disseminating. Learning devices.
Learning models developed in this study include the Learning
Implementation Plan (RPP), Student Book (BS), Student Activity
Sheet (LKPD). In addition, researchers have also developed
research instruments that consist of tests of students'
mathematical communication learning abilities. After being
analyzed using learning tools it can be concluded that there is an
increase in students' mathematical communication skills, where
the average increase in mathematical communication skills of
students from trial I and trial II in the trial I is 0.48 points with
an increase in mastery of learning in 23% classics