PVT PLT WITH AN INSTRUCTOR ABOARD OBSERVING HIS PRACTICE LNDGS; INADVERTENTLY LANDED GEAR UP.

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ATTENDING PLT PROFICIENCY CLASS. AT THIS PARTICULAR TIME; MY INSTRUCTOR WAS GIVING ME THE PROPER WAY TO MAKE SHORT FIELD LNDGS AND TKOFS. ON THE 4TH LNDG; WE PUT GEAR SWITCH DOWN; ADJACENT TO NUMBERS ON DOWNWIND; FLAPS DOWN ON FINAL; 1000 FT ALT AND ABOUT 1/2 MI FROM APCH END OF RWY. DSCNT WAS AT ABOUT 73 KTS. FLARED OVER THE NUMBERS; PULLED OFF PWR AND THE NEXT THING I KNOW; WE WERE SLIDING DOWN RWY. GEAR SWITCH WAS DOWN AND BREAKER STILL ENGAGED; WHEN WE STOPPED. GEAR WAS TIGHTLY TUCKED INTO WHEEL WELLS. BOTH THE INSTRUCTOR AND MYSELF THOUGHT WE REMEMBERED THE DRAG FROM THE WHEELS COMING DOWN. WE HAD BEEN GETTING LIGHTS WHEN GEAR WAS DOWN; BUT CAN'T REMEMBER; SPECIFICALLY; ON THIS PASS. MAY BE ABLE TO TELL WHAT MALFUNCTIONED WHEN WE GET PLANE INTO REPAIR FACILITY. VERY LITTLE DAMAGE; RELATIVE TO WHAT COULD HAVE OCCURRED. PROP BENT; NOSE WHEEL DOOR BENT; FLAPS GND OFF ON TRAILING EDGE; AND SKIN CRACKED WHERE ANTENNA WAS PUSHED UP IN BELLY. NO STRUCTURAL DAMAGE TO FRAME. NO INJURIES AND NO SPARKS OR FIRE.