Answer:
4/10
Step-by-step explanation:
0.4 is said by "four-tenths." Fractions are also said the same way. Notice how there is a four and a ten. This should be easier to help you make decimals in fraction form. The four would be the numerator and the ten would be the denominator, making the final answer 4/10. 
 
        
                    
             
        
        
        
Step-by-step explanation:The volume of each cube = (side)^3 = (1/3)^3 = 1/27 cubic units
 
The number of cubes that will fill the prism =
 
Vol of prism 4
__________ = _____ = 4 * 27 = 108 cubes
Vol of cube (1/27)