First, we need to change all mixed number to improper fraction. 3 1/4=13/4 Volume of box= 13/4×3×1=39/4 Volume of one foam block: 1/4×1/4×1/4=1/64. To find the final answer take: 39/4÷1/64 =39/4×64 =624 blocks. As a result, there are total 624 blocks that can fit into the box. Hope it help!