The aim of this study is to improve the ability of students’s application on
mathematics in grade XI-TO1 SMK Ma’arif 1 Kroya through Problem Based
Learning (PBL). The subjects of this study were students of class XI-TO1 SMK
Ma’arif 1 Kroya totaling 37 students are all male. This study is an action research
conducted in three cycles with each cycle consisting of 2 meetings. The first
meeting is used for learning process and the evaluation tests held at the end of the
cycle. Each cycle includes planning, implementation, observation and reflection.
The results of mathematical application ability test cycle I founded that an average
score for each indicator is 2.56 with the criteria quite well, and it increase in the
second cycle with 2.76 with quite well criteria and increase again in the third
cycle with 2.90 with good criteria. It can be concluded that the Problem Based
Learning can improve the ability of students’ application mathematics in grade
XI-TO1 SMK Ma’arif 1 Kroya.