A BE76 LANDED WITH LNDG GEAR UP BECAUSE OF FAILURE TO USE PRINTED CHKLIST.

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ON AUG/XA/06 MYSELF AND ANOTHER CFI BOTH WITH COMMERCIAL MEL WITH INST PRIVILEGES SET OUT TO BUILD SOME MULTI-ENG TIME. WE TOOK OFF FROM STC AROUND XA:30 LCL TIME WITH ME AT THE CTLS TO DO SOME PRACTICE INST APCHS. I FLEW THE VOR RWY 13 APCH TO MINIMUMS; WENT MISSED AND PROCEEDED TO SHOOT THE ILS RWY 31 APCH TO MINIMUMS WENT MISSED AND PROCEEDED TO THE SE TO DO THE VOR-A APCH AT MGG TOOK THAT TO MINIMUMS DID A CIRCLE-TO-LAND RWY 10 LANDED TAXIED BACK; TOOK OFF AND FLEW L TFC FOR RWY 10; LANDED AND POSSIBLY DID ONE MORE OF THE SAME. AFTER THAT THE OTHER CFI ON BOARD TOOK THE CTLS TO DO SOME TKOF AND LNDGS. THE OTHER CFI IN THE SEAT PROCEEDED TO DO A NORMAL TKOF AND FLY A NORMAL PATTERN. EVERYTHING SEEMED TO BE FINE. I REMEMBER THE PLT PUSHING PROPS FULL FORWARD WHICH COMES AFTER GEAR EXTENSION IN OUR TRAINING. I DIDN'T THINK TO DOUBLECHK HIS WORK. FINAL APCH WAS NORMAL. UPON XING THE END OF THE RWY 10-15 FT AGL; WE HEARD 'GEAR; GEAR' OVER THE RADIO. AT THE TIME OF THE SECOND 'GEAR;' THE BACK END OF THE ACFT HIT THE GND; AND ABOUT 1 SECOND LATER THE REST OF THE ACFT MADE CONTACT WITH THE GND. WE PROCEEDED TO SKID DOWN THE RWY COMING TO A STOP ABOUT 2/3 DOWN THE RWY. UPON STOPPING WE OPENED THE DOORS. BEFORE EXITING; I MADE SURE ALL 6 CTLS ON THE THROTTLE COLUMN WERE PULLED BACK; FUEL VALVES WERE SHUT OFF; BOOST PUMPS WERE OFF; AND MASTERS OFF. NEITHER OF US SUSTAINED ANY INJURIES; WX WAS NOT A FACTOR. MINIMAL ACFT DAMAGE. CHAIN OF EVENTS: I BELIEVE THAT THE MAIN REASON THE INCIDENT OCCURRED WAS BECAUSE A PHYSICAL CHKLIST WAS NOT USED; INSTEAD A MEMORY CHKLIST WAS USED. WE DISCOVERED THE ISSUE ON IMPACT. CORRECTIVE ISSUES WOULD BE TO ALWAYS DOUBLE AND TRIPLE CHK ACTIONS TAKEN AND TO USE A PHYSICAL CHKLIST.