4х25х3=300 4x5x5=100 or 4x25=100; 4x11*5=220 1) 24(8*3)x75(25*3)=1800; 36(3*3*4)*5*5=900; 8*55(5*11)=440 2) 32(8*4)*75(25*3)=2400; 48 (2*8*3)*25(5*5)=1200; 12(6*2)*55(5*11)=660