17300*50=865000
630*600:7=54000
630*600=378000. 378000:7=54000
6200*70:8=54250
6200*70=434000. 434000:8=54250
3058*500=1529000
2640*500=1320000
7400*50:8=46250
7400*50=370000. 370000:8=46250
483*1=481 0*483=0 532*1-532:532=531 (532-1)
483:483=1 0:483=0