<![CDATA[Abstract This research aimed to describe the improvement of students’ ability to use FPB (Greatest Common Factor) and KPK(Lowest Common Multiple) to solve everyday mathematic problems by utilizing cooperative model jigsaw on the fifth grade students at SD Negeri 28 Pontianak Utara. The form of the research was descriptive study with classroom action reseach method counducted in 2 cycles. The data collecting technique were direct observation and measurement. The tols used were observation sheets and test. The findins of the research show an increase in the average score for teacher’s ability to compose lesson plans from 3,25 in cycle 1 to be 3,65 in cycle 2. The increase was noticeable at 0,40 point. The average score of teacher’s teaching activity had an increase by 0,81 point from 2,94 in cycle 1 to 3,75 in cycle 2. Moreover, the average score of students’ learning outcomes in quiz had an improvement by 17,6 points from 81,8 in cycle 1 to 99,4 in cycle 2. In the evaluation, the average score was also improved by 22,3 point from 75,1 in cycle 1 to 97,4 in cycle 2. The findings indicated that the teacher’s ability to compose lesson plans and to conduct teaching, as well as the student’s learning outcomes of mathematics subject regarding the use of FPB (Greatest Common Factor) and KPK(Lowest Common Multiple) to solve everday matchematics problem through cooperative model jigsaw in the fifth grade could be improved. Keywords : Learning Outcomes, Mathematic, Cooperative Model jigsaw.]]>
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