The background of this research is the low of mathematics learning result of grade 1 student of SDN 004Tembilahan Kota, for that done perbaiakan learning process by applying method of discussion. This researchwas conducted in SDN 004 Tembilahan Kota with the subject of research is the first grade students with 36students. This research is a classroom action research conducted two cycles. Based on the results of theresearch, it is found that the use of the method of disuksi can improve the students' learning outcomes aboutknowing and determining the length and weight with nonstandard units using concrete objects / concretesituation in the initial data, the total number of completed students is 12 students (33.3%) average 55.83. In thefirst cycle has increased the number of students who complete is 26 students (77.22%) with an average value of80.00. In the second cycle has increased with the total number of students who completed is 32 students (88.89)with an average value of 88.06.