The purpose of this study is to describe the process of applying problem solving methods to improve mathematics literacy skills in Marsudirini elementary school. Classroom action research using Kemmis and Mc. Taggart. The subjects of this study were first grade students with a total of twenty children . The steps in this research are: 1) Planning; 2) Implementation; 3) Observations; 4) Reflection. Analysis of the data used is qualitative and quantitative. The qualitative data uses the Miles and Hubberman model. The results of this study are that the average value of mathematics literacy in class I SDS Marsudirini is 35.13%, in Cycle II 57.44% and Cycle II by 82%. In the pre cycle to cycle I there was an increase of 22 , 31 while in the first cycle to Cycle II there was an increase of 24.56% .

Keywords : Mathematics Literacy, Problem Solving Method and Action Research.