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126*5=126*10:2=1260:2=630
468*5=468*10:2=4680:2=2340
87*50=87*100:2=8700:2=4350
564*50=564*100:2=56400:2=28200
340:5=340:10*2=34*2=68
730:5=730:10*2=73*2=70*2+3*2=146
6800:50=6800:100*2=68*2=(70-2)*2=140-4=136
8900:50=8900:100*2=89*2=(90-1)*2=180-2=178