Effectiveness of Ubiquitous Geometry system on fifth grade students to learn geometry through measuring real geometric objects, is investigated. 75 fifth grade students were participated in this study during five weeks, where they were divided into three groups and each group used a different learning ways. The Main goal of this study is to consolidate, motivate and improve students' geometric learning by providing a system which has two major activities, peer assessment and competition. Activities are designed to facilitate interaction of students and learning. An experiment was conducted to evaluate the learning achievement. The results showed that students' geometry leaning performance have been improved significantly by using the provided Ubiquitous Geometry system.