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The purpose of this study was to determine the effect learning multimedia on studentsââ¬â¢ ability to answer problems on heat concepts, especially in the analysis of the of energy in water form change. The study was conducted in class X of SMAN 3 Mataram. Total number of sample was 80 students, divided into two classes: 42 students in Experimental class taught using interactive learningmultimedia, and 38 student in control class taught without interactive learningmultimedia. Data were analyzed using ANOVA. The results showed that the ability of the students working on the energy analysis is better in the experimental class than the control class (ñ = 0.05; sig = 0.03).