The Effect of Using Open Approach that Affects Mathematics Achievement and Mathematical Problem-Solving Skills of Grade 6

Abstract

This research aimed to (1)compare mathematical achievement, and mathematical problems-solving skills before and after using Open Approach. (2) to study attitudes towards mathematics after using Open Approach. The sample was grade 6 students from Thesaban 5 Siharakwittaya school. Which was randomly selected using cluster random sampling. The research instruments consisted of a learning management plan, a mathematics achievement test which was a 4-choice multiple choice test with 20 items, with an IOC between 0.67 - 1.00, a reliability value of 0.80, a difficulty value between 0.20 - 0.70, and a discrimination value between 0.25 - 0.63. A mathematics problem-solving ability test which was a subjective test with 5 items, with an IOC between 0.67 - 1.00, a reliability value of 0.81, a difficulty value between 0.52 - 0.79, and a discrimination value between 0.20 and 0.88 And an attitude test which was a 5-level rating scale with 10 items, with an IOC between 0.67 - 1.00, and a reliability value of 0.80. The research results were found that; Grade 6 students had mathematical achievement, and mathematical problems-solving ability after using Open Approach higher than before at .05 level of significance. They had attitudes towards mathematics overall in high level, when considering each aspect, it was found that students thought that mathematics could be used in daily life in the highest average, They love playing math games and they think math is a useful subject.