<![CDATA[The purpose of this reseach was to describe the percentage of concept errors, procedural errors, miscalculations errors and types of errors in the work of GCD and LCM matter most often done fourth grade students of SD Negeri Kyai Mojo. This type of research is quantitative descriptive. The subject of this  research is fourth grade students of SD Negeri Kyai Mojo and fourth grade teacher of SD Negeri Kyai Mojo. Collection techniques using tests, interviews, and documentation. The test of the instrument uses the used intrument test. The validity of the question items tested using product moment correlation obtained by nine valid results. Instrument reliability tested using Alpha Cronbach calculation obtainedof 0.8857 (reliable). Validity uses triangulation of data collection techniques. Analytical techniques use quantitative and descriptive analysis. The result of the research shows that: 1) The error of concept is 48,52%; 2) A procedure error of 70%; 3) Calculation error of 50%; and 4) The type of error most often experienced by students is procedural error with percentage of 70%.]]>
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