The term mathematical power is regarded as a whole of abilities in connecting, reasoning and communicating. The aim of this
study is to evaluate mathematical powers of 5th grade primary students. The study is qualitative. It has been fulfilled 2009- 2010
Autumn semester. Observation and interview techniques were used to collect the data. In the process of practice, students were
given arithmetical problems, and their mathematical powers were tried to determine by evaluating their way of problem-solving
processes. Evaluation rubrics and observation forms prepared by the researchers were used to analyze and evaluate the data. The
practice lasted 5 weeks and total 9 problems were used. The result of the study is as follows: Students are able to make
connections in mathematics but they are not able to use mathematical processes out of mathematics. The students can be said to
have low level of reasoning. Their ability to communicate can be determined as mid level.