Abstract
Development of knowledge, skills and competences for the mathematical quantity of “length” and its measurement units represent important part of the overall education in mathematics for students from Grades 1. – 4. 
 This research work systematizes some theoretical concepts related to the competences. Based on the analysis of the relevant legislation in force in the Republic of Bulgaria researchers presented the relations between the specific mathematical competences and terminology from the competency Cluster “Measurement”.
 The research work is aimed at the development of such a methodology system of work which gives priority to practical productive activities thus facilitating development in primary school students of a higher level of knowledge, skills and competences related to the mathematical quantity of “length” and its measurement units.
 The new system of work was applied during the compulsory classes in mathematics in Grades 1. – 4. The research work presents some of the developed and applied options of practical activity.
 The researchers studied the objectiveness, the validity and the reliability of the set of tools and means used for doing diagnostics as well as the difficulty and the dividing (separating) strength of the mathematical tasks included in it. The results from the experimental work were statistically processed.
Highlights
IntroductionOver the recent years the mathematical tests in the Republic of Bulgaria for national external assessment for Grade 4 show that students have results lower than expected when solving tasks related to the mathematical quantity “length” and its measurement units
The aim of this research is to systematize and present the main theoretical concepts regarding specific competences and to develop a new methodology system of work incorporating multiple practical activities as well as to study the level of development of knowledge, skills and competences related to the mathematical quantity “length” and its measurement units in the education of mathematics for Grades 1.-4
The percentage of the Grade 4 students from the experimental class who correctly solved text tasks related to the mathematical quantity “length” and its measurement units increased by 25.17%
Summary
Over the recent years the mathematical tests in the Republic of Bulgaria for national external assessment for Grade 4 show that students have results lower than expected when solving tasks related to the mathematical quantity “length” and its measurement units. The aim of this research is to systematize and present the main theoretical concepts regarding specific competences and to develop a new methodology system of work incorporating multiple practical activities as well as to study the level of development of knowledge, skills and competences related to the mathematical quantity “length” and its measurement units in the education of mathematics for Grades 1.-4. In order to achieve the aim of the study the following tasks were completed: study and theoretical analysis of: research works of foreign and Bulgarian authors related to the competency approach, the competences and legal documentation concerning the education in mathematics in Primary school; the systematization of specific mathematical competences and the presentation of typical specific interrelations between themselves; the development of a methodology system of work where priority was given to practical activities as well as the application of this system in the education of mathematics for Grades 1.-4. H. Roegiers (1985, p.133) considers mathematical quantities as characteristics of objects or events that could be quantitively determined
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