: This quantitative research aims to determine: (1) The effectiveness of the learning model of Numbered Head Together towards the understanding of the concept of student learning. (2) The effectiveness of the learning model of Numbered Head Together on student learning outcomes. (3) To know the difference between classroom learning outcomes that are subjected to those without treatment. This research is a quasi experimental. The study design using the one-shot case study. The study population numbered 64 people. The trials include testing instrument validity, reliability, power is different, and the level of difficulty. Test the hypothesis using SPSS 16. Based on the calculation results of hypothesis testing, with test two factors Fhit freedom of 23,195 to 17,667 Fhit learning outcomes and with a significant 0,00 < 0,05 for students \u27understanding of the concept, the interaction model of learning by students\u27 understanding of the concept of Fhit 3,668 significant 0,031 < 0,05 can be concluded H0 and may imply that the use of learning with Number Head Together models can improve the understanding of the concept and student learning outcomes. with an average of learning outcomes for the experimental group control group of 86,25 and 75,15
