Another approach that would also give you internal subdivision would be to start with the smaller block and select it, then use the Move tool with the modifier key to make it be a copy, and drag the left end of the block along the red axis to snap against the right end of the block. You could then type 4x and press the enter key to make the run of four. Then select all of that and use the Move tool in the green axis to make the next set. Type 4x again and you have your 16 blocks. Same again, in the blue axis, and you’ll have 32 blocks, all identical, and with internal faces.