find total volume
volumetotal/volumecube=number of cubes
volume total=length time width times height
length=5 and 1/4=5.25
width=4
height=12
volmetotal=5.25 times 4 times 12=252 cubic meters
volume cube=side^3
side=1/4
volume cube=(1/4)^3=1/64
vtotal/vcube=252/(1/64)=252*64=16128
16128 cubes can fit