1.25x12=25x(4x3)=(25x4)x3=100x3=300 2.25x12=5x5x2x2x3=(5x2)x(5x2)x3=10x10x3=300 3.25x(10+2)=25x10+25x2=250+50=300 4.(20+5)x12=20x12+5X12=20x(3x4)+5x(4x3)=60x4+(5x4)x3=240+60=300
