<![CDATA[Research this comes from fact at the site which is at class IV. SDN at Pasaman Barat that learned result about log net and low cube caused by teacher inaccurate utilize learning approachings. Seeing phenomenon upon researcher interests to apply Konstruktivisme's Approaching. To the effect this research to increase studying result nets logs and cubes with konstruktivisme's approaching. Approaching that is utilized is kualitatif's approaching and quantitative with actions observational type braze. This observational subject student brazes IV. SDN at Pasaman Barat that total 22 childs, one that consisting of 10 males and 12 females. tech that is utilized in data collecting as observation, interview and child documentation, hereafter at o with percentage tech. Action research brazes this is done in two cycles. Observational result at each cycle has pointed out to mark sense result step-up studies student. On i. cycle average yielding learned student 64%,experiencing step-up on cycle II. 90%.Penilaian RPP . cycle which is 89%, on cycle II. 100%. Of i. Cycle teacher aspect 85%, cycle II. 100%, of i. cycle student aspect 91 % cycle II. 100%.Dengan such gets to be concluded by learning determines jarring log net by use of approaching konstruktivisme can increase Kata Kunci: hasil belajar; jaring-jaring balok dan kubus; pendekatan konstrutivisme]]>
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