The purpose of this study was to determine the effect of the application of cooperative learning modelNHT (Numbered Heads Together) against numeracy class divisions II SD Negeri 3 Mlekangacademic year 2014/2015. This research is a classroom action research with two cycles of stages ineach cycle; preparation of action plans, giving action, observation, reflection. The subjects were allstudents of class II. Before learning improvement of 8 students only two students who achievemastery learning, or 25%, while 6 students, or 75% has not been thoroughly studied. In the firstcycle of learning improvements, of 8 students there are 6 students who achieve mastery learning, or75%, whereas 2 students or 25% has not been thoroughly studied. Students' understanding of thematerial division two digit numbers from before repair than after the first cycle of learningimprovement has increased significantly. From 25% to 75%. From the results of evaluation of theindividual given before using learning model NHT (Numbered Heads Together) in the form of theuse of props simple, there are only 2 children of 8 students who already understand about thedivision number two figures, it means that only 25% of students who are capable and the rest asmany as six students, or 75% of students who have not been able. After the assessment of learningmedia in the form of the use of simple props, interests and learning outcomes of students increased to7 students (87.5%). While one student (12.5%) needs to enrichment and individual guidance, it isbecause the students do not attend or do not attend school during the discussion of the materialsupplied.