120X32=(100+20)X(30+2)=100X30+100X2+20X30+20X2=3000+200+600+40=3840
6×8×4×20
120*32=120*30+120*2=3600+240=3840
120x32=(100x32)+(2x32x10)=3200+640=3840
120*32=<30+2>*120=30*120+2*120=3600+240=3840