This quasi experimental study was conducted to investigate the effects of Teams Games Tournament Coperative Learning (TGT Cooperative Learning) on students self regulated learning ability, as well as on students mathematical reasoning and connection abilities. By applying a "pre-post-test control group design", the population of the study was students of SMPN 1 Tasikmalaya, while the randomly purposive sample was two classes of grade 7. One class was assigned as experimental group, treated through TGT Cooperative Learning, while the other class as control group, treated through direct instruction. The instruments used to collect data were tests of mathematical reasoning and connection abilities, questionnaires of students' self regulated learning, and observation sheets. The results showed that: the average score of students treated through TGT Cooperative Learning, was high on self regulated learning, as well as on mathematical reasoning and mathematical connection ability compare to students treated through direct instructions; there was no interaction between the gain of students mathematical reasoning ability, as well as students' mathematical connection ability between students treated through TGT Cooperative Learning and those treated through direct instruction.