This research aims to know the influence of the application of mathematical approach is realistic and critical thinking towards problem-solving ability of grade V primary school in Tangerang. This type of research is to experiment with the use of the technique of simple random sampling has been done to 60 students. Retrieval of data obtained through tests and analyzed using the variant analysis (ANAVA) two lanes with a design treatment by level 2 x 2.Research results showed: (1) problem solving Ability among students who are taught using realistic mathematical approach higher than students taught using conventional methods, (2) there is the influence of the interaction between the application realistic mathematical approach to critical thinking and problem-solving abilities, against (3) problem solving Ability among students who are taught using realistic mathematical approach higher than students taught using methods the conventional group of students who have a high, critical thinking and (4) problem solving Ability among students who are taught using conventional methods is higher than students taught using a mathematical approach is realistic on a group of students with critical thinking.The results of this research show that the mathematical approach with a realistic critical thinking was able to increase the ability of solving math problems.